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19 July, 21:50

A Nagoya University study found that birds start singing in the spring when the days are what?

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  1. 20 July, 01:20
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    The Nagoya University study headed by Takashi Yoshimura revealed that birds start singing in spring when days are longer. Their behavior was linked to a hormone called Thyrotrophin which is triggered during longer days. The process results in the expansion of the male testes in birds, which make them sing.
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