Mammals:
* Grazing Animals: Cattle, horses, sheep, goats, deer, elk, rabbits
* Predators: Foxes, coyotes, wolves (in some regions), badgers, weasels
* Small Mammals: Mice, voles, squirrels, chipmunks, groundhogs, moles
Birds:
* Songbirds: Robins, sparrows, cardinals, finches, bluebirds
* Birds of Prey: Hawks, owls, eagles
* Ground-Nesting Birds: Quail, meadowlarks, turkeys, grouse
Insects:
* Bees: Honeybees, bumblebees, solitary bees
* Butterflies: Monarchs, swallowtails, painted ladies
* Beetles: Ladybugs, ground beetles, scarab beetles
* Grasshoppers: Crickets, katydids
* Ants: Various species
Reptiles and Amphibians:
* Lizards: Lizards like the fence lizard and the western fence lizard
* Snakes: Garter snakes, rattlesnakes (in some regions)
* Frogs and Toads: Bullfrogs, green frogs, toads
Other:
* Worms: Earthworms, nematodes
* Spiders: Wolf spiders, orb weavers
* Invertebrates: Snails, slugs, centipedes
Factors that Influence Animal Life in Fields:
* Climate: Fields in different climates will support different types of animals.
* Geography: Fields in different regions will have different animal communities.
* Plant Life: The types of plants in a field determine the food sources available for animals.
* Human Activity: Farming practices, grazing, and other human activities can influence the animals living in a field.
It's important to remember that this is just a general overview. The specific animals in any given field will depend on a variety of factors.