Frogs may contain a variety of foods in their stomachs, including insects, mollusks, worms, arachnids, amphibians, reptiles, rodents, birds and fish. Frogs swallow their prey whole, so it is often possible to identify their recent prey items upon dissection. Most frogs used for dissections are medium-sized species that prey primarily on insects, arachnids and other frogs, but occasionally one is found to have swallowed a fish or snake.
Frogs primarily rely on their vision to find prey, and they often fail to notice prey that does not move. Scientists studying the prey-capturing habits of leopard frogs have found that while frogs can see insects that are 90 degrees to their right or left, they prefer to capture prey that is in front of them. However, frogs sometimes attempt to capture prey to either side, and some individual frogs demonstrate a preferred side.
While some frogs actively forage for food, the vast majority simply wait motionlessly for prey to come within range. Once the prey is close enough, frogs open their mouths and extend their tongues. Covered in sticky mucus, the tongue ensnares small prey. When attacking larger prey, the frog's arms are sometimes used to help force the animal into its mouth.Learn More
Frogs, like most amphibians, excrete solid and liquid waste through an orifice known as the cloaca. Liquid waste enters the cloaca for expulsion through the urinary bladder. Solid waste enters through the colon.Full Answer >
Frogs and humans share a similar body plan, which is reflected in their skeletons, and have organ systems which are broadly similar in shape, location, and purpose.Full Answer >
The diet of frogs varies depending on the species; most consume insects, snails, spiders and worms, while the larger varieties consume small fish, moles, mice, and even other frogs. Frogs consume primarily organisms that are smaller and lower on the food chain: flies, worms, centipedes and other crawling insects are among their favorites.Full Answer >
In the wild, poison dart frogs feed mainly on insects like ants and termites, and on spiders, while a captive frog's diet consists primarily of crickets. Like other frogs, poison dart frogs capture prey with their tongues.Full Answer >