Caption:
Fish, 1. lake stickleback, Spinachia spinachia, Gastrosteus spinachia, 2. nine-spined stickleback (Pungitius pungitius), also small stickleback, dwarf stickleback or stickleback, Gastrosteus pungitius, 3. stickleback, three-spined stickleback (Gasterosteus aculeatus), Historical, digitally restored reproduction from a 19th century original