Some frogs also secrete a toxic or distasteful substance from their skin. Tadpoles eat algae, tiny pond creatures and the corpses of fish and adult frogs. Once on land, a frog becomes completely carnivorous, eating slugs, snails, worms, beetles, flies, moths, woodlice, and some frogs eat other frogs. Frogs vary greatly in natural colours, from the bright green, White s tree frog, Litoria caerulea , to the blue poison dart frog, Dendrobates azureus . Some frogs, such as the gray tree frog, Hyla versicolor , can adjust their colour according to changes in light, moisture, chemicals and temperature.
Frogs usually breed in water, be it a pond, lake, marsh or in puddles after a heavy rain.
The eggs are commonly laid in water, although some eggs develop directly after being laid on land, in soil, beneath logs, in moss, bromeliads, or on leaves. Eggs laid on land are often well-camouflaged, as can be seen in the New Guinean tree frog, Litoria iris, which spawn on green leaves and have green yolks. Frogs reproduce in many ways, from laying eggs to giving birth to live young. When a female frog of the same species arrives, the male grabs her and wraps his forearms around her in a strong hug . This positioning is called amplexus.