Tree frog (Rhacophorus arvalis), inflated vocal sac, courtship, endangered species, Taiwan, Asia

amphibian amphibians animal animals anura arvalis asia asian at behavior behaviour court courting courtship display displays endangered exterior exteriors fauna frog frog frogs inflate inflated inflates inflating kingdom mate mating nature night night time nights nighttime nobody of outdoor photo photograph photographs photos rhacophorus sac salientia season shot shots species taiwan taiwanese time tree vocal wild wildlife woo wooing world