Comment by tptacek

Fun factoid: in the 1930s, it was discovered that you could inject human urine into African clawed frogs; if the frogs subsequently ovulated, the human was pregnant, and for something like 2 decades this became the universal standard test for human pregnancy. It's thought by some that the circulation of those African clawed frogs introduced chytrid pathogens to habitats around the world, since the first recorded pathological chytrid specimens were from South Africa.