A new study analysing two fossilised whale skulls from around 5 million years ago has revealed fragments of sharks’ teeth lodged inside them. This provides rare evidence of how sharks fed on whales in north European waters in prehistoric times.

Sea ice around Antarctica expanded for several decades until a dramatic decline in 2015. The reasons behind this are revealed by research from the University of Gothenburg.

The rocks beneath our feet are leaving a hidden signature in the shells of marine snails along Australia’s ancient coastline, according to new research led by Adelaide University scientists.

New research suggests the endangered smalltooth sawfish may be returning to a critical nursery habitat in the Indian River Lagoon after decades of decline. Following mysterious “spinning fish” events that likely killed hundreds in the Florida Keys, scientists tracked juvenile sawfish and found they repeatedly used the same shallow, mangrove-lined stretch of river across seasons and years. The discovery indicates the habitat may again support early survival – and that protecting these specific areas and improving water quality could be key to the species’ recovery.

Bull sharks form social relationships with specific “friends”, new research reveals.