Birds in cities sing at higher pitch: study


“Because sounds bounce and travel in different ways, birds have to use songs that can cope with this”.

Birds living in urban areas sing at a higher pitch to reduce the impact of echoes from surrounding buildings, a study claims. Higher-pitched songs travel further in built-up areas because their echoes fade more quickly, meaning the following notes are clearer and easier to pick out.


Humans Can Develop Echolocation Used By Dolphins And Bats


In a new research, scientists have shown that human beings can develop echolocation, the system of acoustic signals used by dolphins and bats to explore their surroundings.  The research was conducted by a team of researchers from the University of Alcala de Henares (UAH) in Spain.

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