Creature features

Beavers shape their environment by building dams and lodges, creating wetlands that support diverse wildlife, filter water, and reduce fire risk. Their construction slows water flow, enriches soil, and provides food and shelter for many species. Beavers’ work benefits ecosystems and even humans.

American badgers live in northern Illinois and are known for their bold facial stripes and expert digging skills. They are mostly nocturnal, solitary, and live in underground burrows. They hunt small mammals and sometimes team up with coyotes to catch prey. Though not true hibernators, they enter torpor in winter, staying underground on cold days. Their strong sense of smell and digging abilities make them skilled hunters and survivors in the wild.

Barn owls have heart-shaped faces and ghostly white feathers and are skilled nocturnal hunters found in fields and barns. Known for their eerie screech, they rely on incredible hearing to locate prey. Unlike most owls, they nest in buildings and often stay year-round. As natural habitats shrink, people can help by building nest boxes if they live near open land and give the owls space and privacy.

Trumpeter swans are the largest waterfowl in the world, weighing up to 35 pounds with a wingspan over 6 feet. Named for their trumpet-like calls, they use sound and foot slaps to communicate. They need long “runways” to take flight and incubate eggs using their feet. Once nearly extinct, they’ve made a strong comeback thanks to conservation. Though no longer endangered, they face risks like habitat loss and collisions with power lines.

Illinois is home to two weasel species: the long-tailed and least weasel. They are rarely seen but are fierce predators with long, slim bodies. Both change color in winter for camouflage and are active day and night. They hunt small animals, cache food, and leave behind paired tracks and twisted scat with bones or fur. Long-tailed weasels are more common and tolerant of humans, while least weasels are smaller and prefer quiet, open areas near water.

The plains pocket gopher is a hardworking, solitary digger that builds extensive tunnels underground, improving soil health by increasing aeration and water flow. Equipped with strong incisors, large claws, and cheek pouches, it efficiently digs, cleans, and stores food. Found in sandy soils, it eats underground plant parts and rarely surfaces. Its dirt mounds mark its presence, and its work helps support ecosystems and plant life across Illinois.

Mallards are the most common duck in North America. Males are colorful with green heads, while females are brown and mottled. Only females quack. Mallards are dabbling ducks, feeding at the water’s surface. Ducklings can swim hours after hatching and fly by 50 days. Some migrate, others don’t. They imprint early in life, but imprinting on humans can cause issues. Bread is unhealthy for them and can lead to deformities like angel wing. Their diet shifts seasonally.

Southern flying squirrels glide using skin flaps called patagia and are active only at night. They live in mature forests across Illinois and are the smallest local tree squirrel. Omnivores, they eat nuts, fruit, fungi, insects, and even carrion. They nest in tree cavities, often in old woodpecker nests, and help forests by spreading seeds and eating pests. They breed twice a year and raise litters of 2–5 young.