Amphibians are unique in their ability to live in both water and on the land.Amphibians are metamorphic, meaning they change structure during their life, from an egg, to a tadpole and eventually develop into a frog.Life as a tadpole is spent in the water, at which point they breathe through gills and don't possess limbs.Developing into a frog, tadpoles grow longer and form fins then legs, their tail becomes shorter and their gills are replaced by lungs..
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1: Frogs - Anatomy and Physiology www.ecolinc.vic.edu.au
3: Classification of a cane toad:
Cane toads (Bufo marinus) are large, short amphibians with dry warty skin. They are grey/olive to brown above with a pale belly and have dark irregular spots. Cane toads possess venomous glands for defence. Adults are usually 10-15 cm in length but can reach up to 23 cm. The species is feral in Australia, and is causing considerable habitat destruction and the loss of Australian native fauna species through poisoning and competition. Bufo marinus dissection www.ecolinc.vic.edu.au