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It can grow to a length of nearly 60 feet (18 m), and it lives in warm seas all over the world. This fish takes some time to reproduce because females do not reach sexual maturity until they are 20 years of age. Fish in Danger The situation is especially critical for angel sharks (Squatina squatina) and for the common, or blue, skate (Dipturus batis). The angel shark has now been declared extinct in the North Sea (after having been moved from “vulnerable” to “critically endangered” status), as has the common skate (which has been moved from “endangered” to “critically endangered”).

Two rows of poisonous glands run the length of their bodies. TADPOLES are transported stuck to the back. RETICULATED ARROW-POISON FROG Dendrobates reticulatus TINY PERIL The golden poison dart frog is one of the most poisonous animals on the planet. It can kill 10 human beings with the quantity of poison it stores. BLUE POISON DART FROG Dendrobates azureus The color is bright blue. THE COLOR OF POISON In nature, bright, flashy colors usually serve as a warning sign to predators. Thus, a frog can use color to defend its territory from other males during mating season.

The smallest newts feed on small invertebrates, whereas larger newts can eat fish, amphibians, and eggs. Courtship and mating involve a showy exhibition by both male and female. The male must find a female of the same species and bring her a packet of sperm, which he deposits on the ground or in a pool. Fertilization is internal, and the female gathers the packet into her cloaca. 1 2 3 DANCE Males are attracted by the female's belly, swollen with eggs. The males draw her attention with their showy pigmentation and the flexible crest along their back and tail.

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