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life cycle of the frog click to hear : life cycle of the frog

The stages of development are the egg, the tadpole and the adult; each stage usually lasts several weeks, but can last up to two years in some species.
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tadpole forelimb hind limb operculum external gills eggs

tadpole click to hear : tadpole

Aquatic larva of the frog having a large head and a slender body ending in a tail; it breathes through gills.

forelimb click to hear : forelimb

The forelimbs appear during the last stage of the tadpole’s metamorphosis.

hind limb click to hear : hind limb

The hind limbs appear after the gills.

operculum click to hear : operculum

Thin bony plate of skin covering the gills and having a posterior valvular opening, the hearing organ.

external gills click to hear : external gills

Respiratory organs that filter water and take in food particles; they are later replaced by internal gills.

eggs click to hear : eggs

Embryonic stage of the frog resulting when the egg is fertilized by the sperm.