Amphibians are in decline worldwide, with 2 out of every 5 species threatened by extinction, according to a paper published Wednesday in the scientific journal Nature.

A new global assessment of the world's amphibians finds that more than 2 of every 5 known species is at risk of extinction. Habitat loss, disease and climate change are the main drivers.

It delves deeper into various types of amphibians, their habitats, metamorphosis and the frog life cycle, differences between reptiles and amphibians and more!