African clawed frog
Belgium.
Antwerp National Zoo
The African clawed frog (Xenopus laevis, also known as the xenopus, African clawed toad, African claw-toed frog or the platanna) is a species of African aquatic frog of the family Pipidae. Its name is derived from the three short claws on each hind foot, which it uses to tear apart its food. The word Xenopus means "strange foot" and laevis means "smooth".
In the early 1930s, two South African researchers, Hillel Shapiro and Harry Zwarenstein,who were students of Lancelot Hogben at Cape Town University, developed a test for human pregnancy by injecting the woman's urine into a Xenopus laevis frog. If the frog ovulated, the woman was pregnant. This simple and reliable test was universally used throughout the 1930s to 1960s
African clawed frog
Belgium.
Antwerp National Zoo
The African clawed frog (Xenopus laevis, also known as the xenopus, African clawed toad, African claw-toed frog or the platanna) is a species of African aquatic frog of the family Pipidae. Its name is derived from the three short claws on each hind foot, which it uses to tear apart its food. The word Xenopus means "strange foot" and laevis means "smooth".
In the early 1930s, two South African researchers, Hillel Shapiro and Harry Zwarenstein,who were students of Lancelot Hogben at Cape Town University, developed a test for human pregnancy by injecting the woman's urine into a Xenopus laevis frog. If the frog ovulated, the woman was pregnant. This simple and reliable test was universally used throughout the 1930s to 1960s