Bombina bombina
The fire-bellied toad’s upper side is a mottled green-and-black camouflage, but the underside is a vivid warning: red-orange blotches on black that it flashes with an arch of the back when disturbed. Skin glands secrete a mild toxin that makes this display more than a bluff. From late spring into summer, males call from floating vegetation with a soft, clucking ‘hoo-hoo’, often many at a time, sounding more like a distant flock of birds than a pond of toads.