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No, not all frogs are able to call, but most of them can - the modification of the lungs, chest muscles and vocal cords for calling are seen in the majority of frog (and toad) species, but these tend to be the "newer" frogs, or "neobatrachia" and "mesobatrachia" as is the scientific names for these large groups.

The early/older frog groups such as the tailed frogs (Ascaphidae) don't call at all and the tongueless frogs (Pipidae) generally don't call, those that do don't use the same mechanism of vocal cords as "typical" frogs do but use their larynx to make a series of clicks heard only underwater.

There are also some "newer" frog species that had calling ancestors, but they have since lost the ability to call. Species like the harlequin toads of Central America (Atelopus) live by waterfalls and loud, fast flowing rivers. There isn't much point calling next to a waterfall that will just drown them out, so they actually attract females using what's called a "semaphore" system - which is where they use their legs and "wave" in a very colourful visual display.

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13y ago

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