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FOXP2 variations have contributed to bat evolution and human speech too. When not function correctly it can lead to impaired speech and language learning.

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FOXP2 is found in other vertebrates such as frogs, crocodiles, canaries, and elephants. Other animals like bats use FOXP2 to remember the echolocation to hunt prey. In humans people with a rare FOXP2 mutation have impaired speech and language learning because the neurons don't make proper connections.

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With no FOXP2 birds die before they hatch, if FOXP2 levels reduce before hatching every time they recite a song it will be different than the original. Researchers have also found out that FOXP2 levels go up when learning a new song.

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The protein required to song learn in birds is called the FOXP2 it attaches to DNA and switches genes on or off.
FOXP2 controls genes to build and shape connections between neurons. In song learning connections have to be made between neurons to identify sound and repeat it by storing memories.

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A male zebra finch learns a song from his father, he remembers it and sings it to attract female finches.