Bombina bombina

Bombina bombina is a species of fire-bellied toad native to eastern parts of mainland Europe, where it can be found near waterbodies such as ponds and marshes. It is known for its red colored belly used to ward off predators, an example of aposematism, and its distinctive “whoop” call. The European fire-bellied toad is a medium sized frog, growing up to approximately 5.6 centimetres (2.2 in). The dorsal coloration can vary from gray to brown to green, while the stomach is red with thick black mottling. When threatened by a predator, the fire-bellied toad will lift up its arms (sometimes flipping over) to expose its red coloration and show off its toxicity to the potential predator. This is known as Unkenreflex, and is an example of aposematism. The European fire-bellied toad is listed as least concern by the International Union for Conservation of Nature (IUCN).