With ten species in Maryland, bats can live in MD all year long while others migrate here in the spring and fall. Bats can be found in almost every type of habitat, from deserts to woodlands and suburbs to cities. The common species are the little brown bat and big brown bat. They live and hunt nocturnally in large colonies or small families. Young bats can occasionally enter houses and will explore for a way out. Bats can be known to carry diseases such as rabies and histoplasmosis. Bats routinely find their way into people's property and can spread disease easily.
Beavers are among the largest rodents in North America and if left untreated will cut down over 200 trees per year. Living near the water, they will cut down trees to dam up streams and rivers to create ponds for food.
Resembling small German Shephard dogs, coyotes have begun to appear in Western Maryland as early as 1972 and have boomed since then. Coyotes prey on pets and roaming strays in suburban areas and livestock in rural areas. Rapid decline of free roaming animals is a common sign of coyotes.
With two species in Maryland, red and gray, foxes resemble small dogs and are a threat to livestock and pets. Some foxes have been known to carry rabies.
Opossums are marsupials with grayish white fur that covers all but their ears and tail, which is long and scaly. They are abundant in Maryland and prefer woods near water and urban and suburban environments. They are effective in lowering the tick population. They are commonly aggressive scavengers and carry disease.
Raccoons are abundant in Maryland, with short legs, a striped tail, grayish black fur, and a telltale black "mask" around their eyes. They are a nuissance to animals and humans, well adapted to urban and suburban areas. They will enter homes, basements, attics, and other structures in search of food. Raccoons cause over 60% of rabies cases in Maryland and can cause canine distemper and parvovirus in domestic dogs.
Eastern striped skunks are common in the U.S. and are identified easily by their black fur with two white stripes going down their back. When threatened, skunks will either flee or stand their ground, stomping their front two legs as a warning. If they continue to feel threatened, they will spray butyl mercaptan, a foul smelling liquid, from their backside at their aggressor. Skunks can harass homes and business by scavenging trash and spraying people.
With four species in Maryland being gray, red, flying, and fox, squirrels nest in trees and can be an annoyance in their chattering and barking. Most squirrels in urban areas are rather tame, yet have been know to nest in warm household rooms, such as attics, to escape the cold. Once they have nested in a home, squirrels will chew through insulation and wiring to create fire hazards. They can also infrequently transmit rabies.