June 18, 2014

Through generous support from DTE Energy, the DNR is celebrating the 40^th anniversary of Michigan’s Endangered Species Act from now through September. Each week, an important species will be featured.

Peregrine falcons are the fastest-flying birds in the world, reaching speeds of 200 miles per hour in a dive. Powerful and fierce, the peregrine falcon hunts small and medium-sized birds, dropping down on them from high above. Distinguishable by their dark brown backs and white faces with a black tear on their cheeks, these regal raptors can be seen on cliffs in the Upper Peninsula and in cities across the state.

Peregrine falcons are currently endangered in Michigan. They were included on the first list of endangered species created under Michigan’s Endangered Species Act. Pesticides took their toll on this bird of prey, and they were virtually eradicated from eastern North America by the middle of the 20th century.

After World War II, the use of a new insecticide known as DDT increased. Small birds and mammals accumulated the pesticide in their bodies. Raptors feeding on the contaminated birds and rodents were, in turn, poisoned by a progressive build-up of the pesticide. DDT was especially harmful to birds because it caused eggshell thinning, which resulted in weak eggs that broke under pressure.

After significant recovery efforts, peregrine falcons have made an incredible rebound and are now regularly seen in many large cities and coastal areas. In 2012, there were 12 confirmed nesting pairs in Michigan!

Read more

This time of year, as snakes are out and about in the great outdoors, the Department of Natural Resources gets many questions about Michigan’s snakes. Michigan is home to 17 different species of snakes, 16 of which are completely harmless to humans.

There are two that are very similar and often cause a stir when people encounter them. Eastern hog-nosed snakes, when threatened, puff up with air, flatten their necks and bodies and hiss loudly. (This has led to local names like “puff adder” or “hissing viper.”) If this act is unsuccessful, the snakes will writhe about, excrete a foul-smelling musk and then turn over with mouth agape and lie still, as though dead. Despite this intimidating behavior, hog-nosed snakes are harmless to humans.

The eastern massasauga rattlesnake, the only venomous species found in Michigan, is quite rare and protected as a species of special concern due to declining populations from habitat loss. As the name implies, the massasauga rattlesnake does have a segmented rattle on its tail. It should not be confused with the other harmless species of snake in Michigan that do not have segmented rattles but will also buzz their tails if approached or handled. Read more