April is National Frog Month, and we're marking it with weekly frog and toad-focused live feedings, as well as weekly frog and toad Critter Connections. Since these toad-ally cool critters are going to be in the spotlight this month, we thought we would take a closer look at the different species you might find in Mysteries of the Marsh and our Look-In Lab.
Northern Leopard Frog
Although they can have lots of color variations, the most common variations are green and brown. As the name implies, they are distinguishable by the large, dark circular spots on their back, sides and legs, which are normally bordered by a lighter ring. They're often found in ponds, swamps, marshes, and slow-moving streams, preferring to inhabit bodies of water that have abundant aquatic vegetation. In the summer, they'll actually leave the ponds and move to grassier areas and lawns.
Although the Pickerel and Leopard frogs are similar at a glance, you can tell them apart by taking a closer look at their spots -- while Leopard Frogs have circular spots, Pickerels have irregular rectangular spots. Pickerel Frogs are also uncommon in Illinois, while Leopard Frogs are widesparead. Northern Pickerel Frogs prefer to live near cold, clear water, preferring rocky ravines, bogs and meadow streams. They can also be found around lakes and rivers that are heavily wooded. Unlike many of our other native frogs, Pickerels have a unique defense mechanism -- they can emit skin secretions which are actually toxic to some predators. For humans, the secretions generally only cause skin irritation, but it's important to wash your hands after handling them. This clever defense mechanism makes the Pickerel the only poisonous frog native to the United States!
Northern Cricket Frog
These small, warty frogs generally grow between 1.5 and 3.5 centimeters long. Unlike other frogs, they actually don’t have toe pads, which you can see if you look closely. They can be gray, brown or green and prefer open, shallow water with plenty of vegetation. And, as you probably guessed, their calls resemble that of a cricket.
Gray Tree Frog
While their name suggests that they're only gray in color, Gray Tree Frogs are generally gray, green or brown depending on what they’re sitting on. They can actually change their camouflage from nearly black to nearly white, though they do change at a slower rate than a chameleon. Also, as their name would suggest, they're common in forested areas and are highly arboreal. In fact, they rarely ever descend from the treetops, with the main exception of breeding. Their calls are often heard in rural residential areas of the east coast and Midwest.
Want more National Frog Month fun? Hop on over to our Instagram account! We'll be featuring a new frog or toad friend every Friday as part of our month-long #FrogFriday series. Not on Instagram? You can still follow along by jumping over to our Twitter account or Facebook page!