By analyzing the killer whale population’s calorie requirements as well as narwhals’ calorie content, Garroway and his colleagues estimated that killer whales were preying on about 1,076 and ...

While the killer whales were around, the narwhals hugged the shore, mostly within 500m of the coastline. This seemed to reflect a preference for shallow water less than 100 m deep.

A group of 20 tagged killer whales traveling at fairly rapid speed is followed as they head straight toward the summer nursery grounds of a pod of narwhal and their young.

The Arctic is warming up and killer whales are moving in. That’s bad news for the current tenants, notably the narwhal and the beluga. Up until a few decades ago, orca sightings in Canada’s ...

Scientists have discovered that beluga whales and narwhals go through the menopause -- taking the total number of species known to experience this to five. Scientists have discovered that beluga ...

Narwhals are medium-sized toothed whales who gather to breed amidst Arctic pack ice. Historically, killer whales haven’t been able to access their breeding grounds, but vanishing sea ice has ...

When killer whales weren’t around, the narwhal went after abundant shoals of prey fish between four and 10 kilometres from shore. But when the orcas were anywhere in the inlet, narwhal cowered ...

“Like killer whales and most toothed cetaceans, narwhals are suction feeders, so you see them tapping the fish and sucking them in, swallowing them whole. It could be that this is one of the main ...

The narwhal’s skittish behavior may be as a result of its few but formidable predators: polar bears, killer whales and humans. Narwhals spend most of their time in small pods then join other ...

They knew that the toothed killer whales also go through menopause, based on four decades of research. The researchers combed through anatomical data of 16 related whale species.