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.

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.

Northern harriers are owl-like hawks seen gliding low over grasslands in a V-shaped flight. Males are gray and white, females are brown, and both have a white rump spot. Like owls, they have facial disks for hearing, hunt by sound and sight, and nest on the ground. They eat small mammals and birds and may roost with short-eared owls. Males perform aerial courtship dances and may have multiple mates. Look for them in Will County during fall, winter, and spring migrations.

Skunks are known for their smelly spray, which they use only as a last resort. They live in various habitats, eat almost anything, and aren’t easy prey due to their odor. Not all skunks have stripes—some are spotted or have a single broad stripe. They often live near water and have their young, called kits, in dens. Though they live up to seven years, many die young due to disease or cars. Surprisingly, skunks even eat bees and are immune to their stings.

Gray wolves are intelligent, social animals that live in family packs, communicate through howls, smells and body language, and play a vital role in nature by keeping deer populations in check. Once common in Illinois, they were hunted to local extinction but are now protected. While no full-time packs live in Illinois today, occasional wolves still wander in from nearby states.