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Amazon River dolphin (Boto)

River dolphins observed playing with anaconda

Researchers in Bolivia recorded an unusual interaction between local rivers dolphins and an anaconda snake...
Common bottlenose dolphin

Dolphin pens identified at Russian naval base

Analysis of satellite imagery suggests that Russia may be using military dolphins at its naval...
Orcas in far east Russia.

New fossil gives insight into feeding habits of ancient orcas

New research by scientists suggests that orcas and false killer whales only evolved to feed...

High mercury levels found in slaughtered Japanese dolphin meat

According to reports from Japan, police there are investigating the sale of whale and dolphin...

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.