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Vaquita. Photo Thomas Jefferson

Scientific Committee gives first ever official species extinction warning

Photo: Thomas Jefferson We have welcomed the urgent call by experts to protect the vaquita...
blue whale

Whale fossil from Peru may have been heavier than blue whale

Scientists examining the bones of a 39 million-year-old ancient whale have concluded that it may...
Humpback whale © Christopher Swann

Humpback whales breach in synchronisation

Humpback whales are renowned for their incredible acrobatic displays, but a family in the USA...
Long-finned pilot whale

Unusual activity witnessed before pilot whale stranding

Just days after a pod of long-finned pilot whales stranded on an island in the...

Early whales hearing similar to land animals

Whales and dolphins are renowned for their sensitive hearing but new research published in Current Biology suggests this was not always the case.

Using a CT scanner, scientists examined the fossils of two whales discovered during the last century in Togo, Africa. The whales were around 43-46 million years old, and while they lived in the sea, they still had legs which allowed them access to the land. Even though they would have been feeding on fish, they had not yet developed the ability to echolocate, used by modern-day toothed whales and dolphins.

Examination of their inner ears indicates these early whales could not yet pick up the extremes of high or low frequency sounds their descendants can. The separation into toothed and baleen whales occured around 35 million years ago and while it seems likely their specialised hearing evolved after this, the scientists have not ruled the possibility of discovering a common ancestor with highly developed hearing.

M. Mourlam and M. Orliac. Infrasonic and Ultrasonic Hearing Evolved after the Emergence of Modern Whales. Current Biology. Published online June 8, 2017. doi: 10.1016/j.cub.2017.04.061.