Question

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

Answer 1

Longer

Further Explanation:

There are many birds which sing throughout the winter. One example of the birds which sing throughout the winter is Robin. There are other species of the birds which take up singing during the time of winters only. By singing, both these birds attract the potential mates and signal other birds with regards to boundaries of their patch. These birds specifically burst to songs during mid-January because their cells on the surface of the brain triggers their hormones during the time days get longer and that results in males expanding their tastes.

This knowledge of a new process which is indicated to the birds that is that it is the season which can have implications of the understanding of the reproduction as according to the humans. It was professor sharp who first identified that there is an area in birds which is affected by the changes of the length of the day.  

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Answer Details:

Grade: High School

Chapter: Birds Mating

Subject: Geography

Keywords: Birds, Mating, Days, longer Days, Singing, Professor, Sharp, Tastes, Identify, Hormones.

Answer 2

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.