The Simi Hills are the most critical wildlife corridor linkage from the Santa Monica Mountains — to the Santa Susana Mountains, and beyond to the Topatopa Mountains, San Gabriel Mountains, and other Transverse Ranges further east.
The Simi's undeveloped native habitat provides routes that protect larger land wildlife of the Santa Monicas from genetic isolation.
Large sections of the Simi Hills are protected by parks and open space preserves.
Animals in the area include mammals such as the Virginia opossum, ornate shrew, broad-footed mole, mountain lion, mule deer, bobcat, spotted and striped skunk, California badger, southern California weasel, California raccoon, ringtail cat, black bear, Botta's pocket gopher, desert cottontail, valley coyote, gray fox, California vole, brush rabbit, California ground- and California grey squirrel, as well as several species of mice (California pocket mouse, western harvest mouse, brush mouse, deer mouse, and house mouse), rats (agile kangaroo rat, dusky-footed woodrat, black rat, roof rat, and brown rat) and bats (long-eared myotis, long-legged myotis, California myotis, small-footed myotis, western pipistrelle, Brazilian free-tailed bat, western mastiff bat, and Tejon myotis).
Some of the reptiles in the area include several species of snakes (coachwhip, southern Pacific rattlesnake, San Diego night snake, striped racer, California black-headed snake, two-striped garter snake, San Diego gopher snake, coast mountain kingsnake, California kingsnake, coast patch-nosed snake, ringneck snake) and lizards (western fence lizard, California side blotched lizard, western skink, western whiptail, San Diego horned lizard, California horned lizard, San Diego alligator lizard, silvery legless lizard).
There are ten species of amphibians in Simi Valley: the California newt, western spadefoot, California toad, arroyo toad, California slender salamander, arboreal salamander, American bullfrog, California red-legged frog, California treefrog, and the Pacific treefrog.

Birds in Simi Valley include Anna's hummingbird, Canada goose, mallard, California quail, common egret, great blue heron, American bittern, American coot, killdeer, mourning dove, roadrunner, belted kingfisher, black phoebe, barn swallow, cliff swallow, common raven, crow, white-breasted nuthatch, cactus wren, mockingbird, robin, cedar waxwing, phainopepla, starling, least Bell's vireo, hooded oriole, western tanager, several species of blackbird (western meadowlark, Brewer's blackbird and brown-headed cowbird) and woodpeckers (common flicker, Nuttall's woodpecker, acorn woodpecker, and yellow-bellied sapsucker).
Raptors include turkey vulture, white-tailed kite, American kestrel, poor-will and several species of hawks (Cooper's hawk, sharp-shinned hawk, marsh hawk, red-tailed hawk, red-shouldered hawk, and the common nighthawk) and owls (great horned owl, short-eared owl, long-eared owl, barn owl, and the burrowing owl).
Grosbeaks, finches and sparrows include black-headed grosbeak, house finch, American goldfinch, lesser goldfinch, California towhee, Savannah sparrow, sage sparrow, dark-eyed junco, white-crowned sparrow and the house sparrow.
The Simi Hills are the most critical wildlife corridor linkage from the Santa Monica Mountains — to the Santa Susana Mountains, and beyond to the Topatopa Mountains, San Gabriel Mountains, and other Transverse Ranges further east. The Simi's undeveloped native habitat provides routes that protect larger land wildlife of the Santa Monicas from genetic isolation. Large sections of the Simi Hills are protected by parks and open space preserves. Animals in the area include mammals such as the Virginia opossum, ornate shrew, broad-footed mole, mountain lion, mule deer, bobcat, spotted and striped skunk, California badger, southern California weasel, California raccoon, ringtail cat, black bear, Botta's pocket gopher, desert cottontail, valley coyote, gray fox, California vole, brush rabbit, California ground- and California grey squirrel, as well as several species of mice (California pocket mouse, western harvest mouse, brush mouse, deer mouse, and house mouse), rats (agile kangaroo rat, dusky-footed woodrat, black rat, roof rat, and brown rat) and bats (long-eared myotis, long-legged myotis, California myotis, small-footed myotis, western pipistrelle, Brazilian free-tailed bat, western mastiff bat, and Tejon myotis). Some of the reptiles in the area include several species of snakes (coachwhip, southern Pacific rattlesnake, San Diego night snake, striped racer, California black-headed snake, two-striped garter snake, San Diego gopher snake, coast mountain kingsnake, California kingsnake, coast patch-nosed snake, ringneck snake) and lizards (western fence lizard, California side blotched lizard, western skink, western whiptail, San Diego horned lizard, California horned lizard, San Diego alligator lizard, silvery legless lizard). There are ten species of amphibians in Simi Valley: the California newt, western spadefoot, California toad, arroyo toad, California slender salamander, arboreal salamander, American bullfrog, California red-legged frog, California treefrog, and the Pacific treefrog.
Birds in Simi Valley include Anna's hummingbird, Canada goose, mallard, California quail, common egret, great blue heron, American bittern, American coot, killdeer, mourning dove, roadrunner, belted kingfisher, black phoebe, barn swallow, cliff swallow, common raven, crow, white-breasted nuthatch, cactus wren, mockingbird, robin, cedar waxwing, phainopepla, starling, least Bell's vireo, hooded oriole, western tanager, several species of blackbird (western meadowlark, Brewer's blackbird and brown-headed cowbird) and woodpeckers (common flicker, Nuttall's woodpecker, acorn woodpecker, and yellow-bellied sapsucker). Raptors include turkey vulture, white-tailed kite, American kestrel, poor-will and several species of hawks (Cooper's hawk, sharp-shinned hawk, marsh hawk, red-tailed hawk, red-shouldered hawk, and the common nighthawk) and owls (great horned owl, short-eared owl, long-eared owl, barn owl, and the burrowing owl). Grosbeaks, finches and sparrows include black-headed grosbeak, house finch, American goldfinch, lesser goldfinch, California towhee, Savannah sparrow, sage sparrow, dark-eyed junco, white-crowned sparrow and the house sparrow.
Simi Valley, California