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 must breed in water, be it a pond, lake, marsh or in puddles after a heavy rain. The eggs are commonly laid in water, or less commonly, 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. After this pairing has occurred, which could last for a few hours or several days, the spawning begins. The female then pushes the spawn mass out of her body while pressing her abdomen, and the male spreads his sperm over the exiting egg clump. He releases his grip once the spawning is complete.