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The four stages of an animal's life cycle are an egg, embryo, immature individual and adult. This life cycle is true for most fish, bird, amphibians, reptiles and mammals. More »

www.reference.com Science Biology Zoology

Toucans, found in and around the tropical forests of Central and South America, reach maturity within the first two months of life and can begin breeding. Toucans can live to be approximately 20 years old. More »

www.reference.com Pets & Animals Birds

The life cycle of a boa constrictor consists of the baby stage and the reproductive stage. Female boas bear live offspring that survive independently from birth. Newborn boas immediately hide and begin hunting for food. ... More »

www.reference.com Pets & Animals Reptiles Snakes
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While the most recognizable stage of the grey wolf's life cycle is the large imposing adult, these animals go through several stages from conception to death. The average wolf lives six to eight years in the wild. It gro... More »

www.reference.com Science Biology Zoology

A head louse has a life cycle of three stages: egg, nymph and adult. Difficult to see, nits are lice eggs and are often mistaken for dandruff or hair product. Adult female lice lay nits at the base of a hair shaft close ... More »

www.reference.com Pets & Animals Bugs

The endosperm serves as a source of nutrition for a plant embryo in a seed, somewhat analogous to the yolk of an egg for an animal embryo. It is actually, in a sense, a separate organism, with a genetic code from the com... More »

www.reference.com Science Biology Botany

The flea life cycle encompasses four stages: egg, larva, pupa and adult. In appropriate conditions, a flea completes its life cycle in 18 days, but this time varies depending on the environment. More »

www.reference.com Pets & Animals Bugs