Advancing from mice to frogs, South African scientist Lancelot Hogben experimented a fair bit on clawed frogs. The advantage he found in using frogs was their eggs were much easier to examine those of mice.
In his experiments, Hogben found that the South African clawed frog, Xenopus laevis, worked quite well as a human pregnancy test. So, if the female frog was injected with the urine of a pregnant woman, the frog would lay eggs on that same day.
This rather accurate test became quite popular in Europe in the 1930s.
And by the way, that's an image of a real clawed frog!
Source: IFL Science Health and Medicine
Republished with permission from: theAsianparent Singapore
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