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 » 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 » Pets & Animals Birds

The life cycle of the rabies virus is transmission, incubation, early symptoms (prodrome period) and encephalitis phase. Rabies is transmitted to a human or other animal through saliva from an infected animal, in which c... More » Science Biology
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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 » 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 » 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 » 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 » Pets & Animals Bugs