Gustav Kramer

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Gustav Kramer (11 March 1910 – 19 April 1959) was a German zoologist and ornithologist who specialised in allometry. He described ''Xenopus laevis'', the African clawed frog, for the first time in his doctoral thesis. Near the end of the 1940s, he discovered that birds can use the sun as a compass. Provided by Wikipedia
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