land biomes. biomes are large regions characterized by a specific type of climate and certain types...
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Land Biomes
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Land Biomes• Biomes are large regions characterized by a specific type of
climate and certain types of plant and animal communities.• Each biome is made up of many individual ecosystems.
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• Biomes are described by their vegetation because plants that grow in an area determine the other organisms that can live there.
• Plants in a particular biome have characteristics, specialized structures, or adaptations that allow the plants to survive in that biome.
• These adaptations include size, shape, and color. For example, plants in the tundra tend to be short because they cannot obtain enough water to grow larger.
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• Climate is the average weather conditions in an area over a long period of time.
• Climate is the main factor in determining which plants can grow in a certain area, which in turn defines the biome.
• Temperature and precipitation are the two most important factors that determine a region’s climate.
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• Most organisms are adapted to live within a particular range of temperatures and will not survive at temperatures too far above or below their range.
• Precipitation also limits the organisms that can be found in a biome because all organisms need water, and the bigger the animal, the more water it needs.
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• Latitude is the distance north or south from the equator, and is expressed in degrees.
• Altitude is the height of an object above a reference point, such as sea level or the Earth’s surface.
• Climate varies with latitude and altitude. • For example, climate gets colder as latitude
and altitude increase. This is why it gets colder as you move further up a mountain.
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Land BiomesThe 6 most common biomes are:
• Tundra• Taiga• Temperate Deciduous Forest• Tropical Rain Forest• Grassland (Prairie, Tropical
Savanna, Chapparal)• Desert
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Land Biomes
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TundraFound in parts of Canada, Alaska, and Siberia
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Tundra – “The Cold Desert”
• Found at latitudes around the North Pole
• Less than 25 cm precipitation yearly
• Very cold year round (-40ºC in winter)
• Cold, dry, treeless region
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Tundra –“The Land of the
Midnight Sun”
• Winter lasts 6 to 9 months with no daylight
• Summer is short and cold with 24 hours of sunlight a day
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Tundra-
• Soil is poor
• Permafrost–Layer of permanently frozen soil
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Plants of the Tundra
Tundra plants are resistant to drought and cold
Examples:
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Plants of the Tundra• Reindeer moss – It’s a lichen!
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Plants of the Tundra• Lichens
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Plants of the Tundra• Lichen
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Plants of the Tundra
• True Mosses
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Plants of the Tundra
• Small shrubs and flowers
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Plants of the Tundra
• Grasses
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Animals of the Tundra
Many animals of the tundra migrate there during the short summer
Examples:
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Animals of the Tundra• Biting insects
Mosquito Blackfly
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Animals of the Tundra• Snowy owl
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Animals of the Tundra• Arctic hare
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Animals of the Tundra• Caribou – “Reindeer”
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Animals of the Tundra
• Musk oxen
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Animals of the Tundra
• Lemmings
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Threats to the Tundra
• The tundra is one of the most fragile biomes on the planet. The food chains are relatively simple so they are easily disrupted.
• Until recently these areas have been undisturbed by humans. But oil was located in parts of the tundra, and oil exploration, extraction, and transport has disrupted many tundra habitats.
• Pollution caused by spills or leaks of oil and other toxic materials may also poison the food and water sources of organisms of the tundra.
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Taiga or Coniferous ForestFound in parts of Canada, Alaska, and Russia
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Taiga or Coniferous Forest
• World’s largest land biome
• Latitudes between 50ºN and 60ºN
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Taiga-
• Warmer and wetter than the Tundra
• Winters are long and cold
• 35 to 40 cm of precipitation yearly (mostly snow)
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Plants of the TaigaThere is no permafrost, so trees can
grow. Mosses and lichens grow on the forest floor.
Examples:• Cone-bearing Evergreen trees• A conifer is a tree that has seeds
that develop in cones. Their leaves’ arrow shape and waxy coating helps them to retain water in the winter. The conifer’s shape also helps the tree shed snow to the ground and not get weighed down.
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Plants of the Taiga• Fir tree
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Plants of the Taiga• Spruce tree
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Plants of the Taiga• Hemlock tree
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Plants of the Taiga• Liverwort (a moss)
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Plants of the Taiga• Mosses
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Animals of the Taiga
Many animals live in the Taiga.
Examples:
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Animals of the Taiga• Moose
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Animals of the Taiga• Black bear
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Animals of the Taiga• Lynx
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Animals of the Taiga• Wolf
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Animals of the Taiga• Badger
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Animals of the Taiga• Wolverine
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Temperate Deciduous ForestFound in Europe, the eastern part of
the U.S.A., and China (This is our biome!!!)
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Temperate Deciduous Forest
• Found below 50ºN latitude
• 75 to 150 cm precipitation yearly
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Temperate Deciduous Forest
• Wide range of temperatures with 4 seasons
• Below freezing in winter to 30ºC in summer
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Temperate Deciduous Forest
• Soil is rich in nutrients from layers of decomposing leaves
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Temperate Deciduous Forest
• Layers of vegetation– Canopy– Understory– Forest floor
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Layers of Vegetation
Canopy- tree tops that shade the ground below
Understory- shrub layer
Forest floor- dark and moist layer of dead leaves, twigs, and seeds
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Layers of Vegetation
Canopy
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Layers of Vegetation
Understory
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Layers of Vegetation
Forest floor
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Life in the Temperate Deciduous Forest
The mild climate and rich soil of the temperate deciduous forest supports a wide variety of plant and animal life.
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Plants of the Temperate Deciduous Forest
Plant life is abundant.
Examples:
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Plants of the Temperate Deciduous Forest
•Oak tree
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Plants of the Temperate Deciduous Forest
•Hickory tree
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Plants of the Temperate Deciduous Forest
•Maple tree
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Plants of the Temperate Deciduous Forest
•Shrubs (Azalea)
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Plants of the Temperate Deciduous Forest
•Shrubs (Holly)
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Plants of the Temperate Deciduous Forest
•Wildflowers
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Plants of the Temperate Deciduous Forest
•Ferns
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Animals of the Temperate Deciduous Forest
Animal life is diverse.
Examples:
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Animals of the Temperate Deciduous Forest
•Deer
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Animals of the Temperate Deciduous Forest
•Fox
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Animals of the Temperate Deciduous Forest
•Snakes (Eastern Garter Snake)
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Animals of the Temperate Deciduous Forest
•Black bear
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Animals of the Temperate Deciduous Forest
•Birds (Bald Eagle, Barn owl, woodpecker, cardinal)
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Animals of the Temperate Deciduous Forest
•Raccoon
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Animals of the Temperate Deciduous Forest
•Amphibians
Wood frog Leopard Frog
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Animals of the Temperate Deciduous Forest
•Amphibians
Spotted Salamander Jefferson Salamander
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Animals of the Temperate Deciduous Forest
•Small Mammals
Field Mouse Squirrel
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Tropical Rain ForestFound near the equator in Africa, South America, Australia, and the Pacific Islands
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Tropical Rain Forest
• Found near the equator
• 200 to 225 cm precipitation yearly
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Tropical Rain Forest
• Hot and humid all year
• Temperatures are fairly constant around 25ºC
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Tropical Rain Forest
• Soil is nutrient poor and acidic
• Most plants have shallow roots
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• There are four main layers of the rain forest:• The Emergent Layer• The Upper Canopy• The Lower Layer• The Understory
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Tropical Rain Forest Layers of Vegetation
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Life in the Tropical Rain Forest
The tropical rain forest is a lush, productive ecosystem containing more than half of all the species that live on Earth.
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Plants of the Tropical Rain Forest
A rain forest may contain more than 700 species of trees and over 1000 species of flowering plants.
Examples:
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Plants of the Tropical Rain Forest
•Mahogany tree
Notice how the roots rise above the ground to help support this giant tree!
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Plants of the Tropical Rain Forest
•Bromeliads
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Plants of the Tropical Rain Forest
•Orchids
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Plants of the Tropical Rain Forest
•Giant ferns
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Plants of the Tropical Rain Forest
•Flowering plants
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Animals of the Tropical Rain Forest
The rain forest is home to a huge number of animals.
Examples:
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Animals of the Tropical Rain Forest
•Monkeys
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Animals of the Tropical Rain Forest
•Exotic birds
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Animals of the Tropical Rain Forest
•Snakes
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Animals of the Tropical Rain Forest
•Sloths
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Animals of the Tropical Rain Forest
•Bat (Fruit bat)
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Animals of the Tropical Rain Forest
•Insects
Butterfly Beetle
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Animals of the Tropical Rain Forest
•Large Cats
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Animals of the Tropical Rain Forest
•Exotic mammals
Paca Peccary
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Animals of the Tropical Rain Forest
•Exotic mammals
Agouti Nutria
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Grasslands
• Tropical Savannas• Prairies• Chapparal
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Tropical Savanna
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Characteristics of the Savanna
• Tropical, rolling grassland scattered with shrubs and isolated trees
• Not enough rainfall to support forests
• Long dry winter with 4” rainfall and rainy summer with 15 – 50 inches of rainfall annually
• 90oF in dry season; 70oF in summer• Clay and sand mixed soils
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Savanna Producers
•Tall, wild grasses
•Acacia trees
•Small shrubs
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Savanna Consumers
• Large herbivores such as antelope, gazelles, giraffes, elephants, zebras, wildebeests
• Large carnivores such as lions, hyenas, and leopards
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Grassland - Prairie“The Bread Basket of the World”
Found on every continent.
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GrasslandGrasslands are known by many names.
U.S.A. – Prairie or Plains
•Asia – Steppe
•South America – Pampas
•Africa –Veldt or Savanna
•Australia - Savanna
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Grassland
• Wet seasons followed by a season of drought
• 25 to 75 cm precipitation yearly
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Grassland
• The soil is rich and fertile.
• The grass has extensive root systems, called sod.
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Plants of the Grassland
Grassland regions of the world are important farming areas. Cereal and grains grow here.
Examples:
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Plants of the Grassland
•Wheat
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Plants of the Grassland
•Rye
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Plants of the Grassland
•Barley
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Plants of the Grassland
•Corn
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Animals of the Grassland
The most noticeable animals in grassland ecosystems are usually grazing mammals.
Examples:
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Animals of the American Grassland
•Bison
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Animals of the American Grassland
•Prairie Dog
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Animals of the American Grassland
•Pronghorn
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Animals of the American Grassland
•Coyote
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Animals of the Australian Grassland
•Long Nosed Bandicoot
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Animals of the Australian Grassland
•Wallaby
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Animals of the Australian Grassland
•Wombat
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Chapparal (Scrub)
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Chapparal Characteristics
• Cross between a grassland and a forest
• May contain mountain slopes and plains
• Hot, dry summers and mild winters• Average winter temperature ~ 46oF• Average summer temperature ~ 72oF• Annual rainfall 15 - 40 inches• Nutrient poor soil with low moisture
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Chapparal Organisms
Producers• Trees such as
oak• Shrubs with
thick waxy coverings to conserve water
Consumers• Aardvark• Coyotes• Lynx• Chipmunks
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Chapparals
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DesertFound on every continent.
The driest biome on Earth
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Desert
• Extreme temperatures- Very hot during the day and cool at night
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Desert
• Very little rainfall
• Less than25 cm precipitation yearly
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Desert
• The soil ranges from gravel to sand.
• Soil is nutrient poor.
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Plants of the Desert
Desert plants have evolved adaptations to help them survive in the extreme temperatures and dryness of this biome.
Examples:
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Plants of the Desert•Cactus
Saguaro Prickly Pear
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Plants of the Desert
•Mesquite
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Plants of the Desert
•Joshua tree
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Plants of the Desert
•Wildflowers
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Plants of the Desert
•Creosote
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Animals of the Desert
The animals of the desert are adapted to the hot temperatures.
Examples:
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Animals of the Desert
•Lizards
Desert Iguana Frilled Lizard
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Animals of the Desert
•Camel
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Animals of the Desert
•Snakes
Diamondback Rattlesnake Sidewinder
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Animals of the Desert
•Scorpion
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Animals of the Desert
•Kangaroo rat
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Animals of the Desert
•Gila Monster
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Animals of the Desert
•Predatory birds
Great Horned Owl Kestrel
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Animals of the Desert
•Tarantula