This is a pair of forest green tree frogs (Zhangixalus arboreus) preparing to spawn. The male has jumped onto the back of the female. From this point, she will carry him to her chosen location, then excrete a substance that the male churns into a bubbly sponge-like mass, into which the female deposits eggs as the male fertilizes. The female bears the weight of the male for the duration, hanging by her forelimbs from a branch or something similar. Photographed in Yamanashi Prefecture, Japan.
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