Karl-Heinz Jungfer is a biology teacher. In his free time, he researches frogs. He wants to save a poisonous frog from the aftermath of the Venezuelan gold rush.

In his spare time, the veterinarian Tobias Eisenberg breeds endangered tree frogs from Latin America.

Uwe Seidel und Philip Gerhardt have a combined 50 years of experience in breeding fire salamanders. For almost a decade, they've shared the same hobby.