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Summary: The difference between frogs and toads is a taxonomic issue not maintained in general naming, though the frogs called 'toads' do tend to have dry and bumpy skin. Learn about frogs and toads from a herpetologist in this free video on recognizing frogs.
"Hi, my name's Tim Cole. I'm with the Austin Reptile Service, and I've been keeping reptiles and amphibians for over forty years. And we're here to talk about the differences between frogs and toads. There are some basic differences that are not hundred percent, but, most of the time. And let's say your frogs have smooth, moist skin, with the toads having a dry, bumpy skin. Now, of course, there are exceptions to that rule. An example would be narrow-mouth toad, which has smooth, moist skin. Some frogs have ridges down their back, and it's not real smooth, like an African bullfrog. But basically, toads like a drier climate. Frogs like a wetter climate. Once again, there's exceptions to that rule. For instance, the Suriname toad, which is an aquatic toad, lives in an aquarium like fish. And you've got some frogs that take a lot of humidity, and some of them don't. Waxy tree frogs in South American can tolerate a lot of dry temperatures for a period of time. You've got spade-foot toads that live out in the deserts in North America that tolerate long periods without water. And these are animals that have learned to lay their eggs and tadpoles hatch and metamorphasize very quickly in roadside ditches in the desert. So they've learned to adapt. So these are some of the differences. Their feet. Most toads, except for the aquatic ones do not have webbed feet, where a lot of frogs do have webbed feet. Of course, your tree frogs don't have webbed feet, but they have little suction-cup like devises that allow them to do their climbing."
eHow Article: Difference Between Frogs and Toads