Ventral surface of Cochranella granulosa, the Granular Glass Frog.

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Ask the frog staff: How many tadpoles actually survive into adulthood?

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Hi Mark. A frog friend and I were at the lily pond today and it was rife with tadpoles of various sizes and stages. Two questions: 1) It looked like the two ducks might be feeding on them ... do they? 2) How many tadpoles actually survive to frog adulthood? — Christine C. This particular topic has come up a lot recently, and one of our visitors beautifully photographed a heron eating a rather large bullfrog out of the lily pond in the Children's Garden . It was a graphic interaction, but demonstrates how vital amphibians are in food webs and one of the reasons we use to illustrate how important it is to keep amphibians around. Almost everything eats them, or their tadpoles, or their eggs ... or all three.  Many animals eat frogs exclusively (including some frog species!), and the herons at the Garden obviously love them. I have seen ducks eating tadpoles quite rapidly. In fact, my amphibian class last summer quantified how quickly different aquatic birds could ...
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'Normal' Tadpole (left) and 'Cannibal Morph' of the Spadefoot Toad ( Scaphiopus ). The larger head morphology allows the developing larvae to go after a wider array of prey items, including Fairy Shrimp (center) ... and each other! A great summary of the larval phenomena of Phenotypic Plasticity ... one of the most dramatic forms is the Cannibal Morph , when normally omnivore/vegetarian tadpoles suddenly grow large teeth and an appetite to consume their siblings. The article contains some interview snippets from Amphibian Foundation Scientific Advisory Board member Susan Walls . Click here to read ...
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Epipedobates tricolor | Phantasmal poison frog (Morispunga morph) Male transporting tadpoles. Frogs are among the most diverse groups of vertebrates . They occur globally from the tropics to the sub-arctic regions, and in just about every conceivable habitat, one can find a frog species that has specialized to live there. Despite this diversity, it is generally easy to tell a frog from any other type of animal. Thanks, in part, to the absence of a tail like most other critters. Due to the range of unique requirements these habitats demand of frogs, each species has specialized behaviors and/or characters and some of these specializations are quite spectacular. Today, we are featuring two species which possess unique, prominent physical attributes. First, and one of the author's favorites is the Phantasmal poison frog | Epipidobates tricolor , which has been living, breeding, singing and hopping around the Fuqua Conservatory since 1995. Most poison frogs (family: dendr...
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