Two yellow-bellied toads (Bombina variegata) are immersed in a pond while three European fire-bellied toads (Bombina bombina) are on the bank, one of them leaping to catch a fly. This picture was drawn from a terrarium view.
Both yellow-bellied and fire-bellied toads belong to the family Bombinatoridae. they have brightly colored ventral sides which they use to warn predators that they are toxic, due to the poison produced by their skin.
The caption reads in the original German:
Feuerkröten (Terrarienbild). 1. Rotbauchige Unke, Bombinator igneus Laur. — 2. Gelbbaurige Unke, Bombinator pachypus Bp.