Tens of thousands of seals in the Salish Sea are devouring millions of adult and juvenile salmon, sparking renewed debate about a cull.

Three dead gray whales washed up on two different Kodiak Island beaches recently. The strandings happened within the span of a week.

Sixteen gray and humpback whales have been reported stranded off Washington and Oregon since April 3, the largest number in nearly two decades.

Gray whale (Eschrichtius robustus) found dead on the beach near Kivalina.

The biggest challenges for whales is the buildup of toxic chemicals in their bodies and the shrinking runs of Chinook salmon, their primary prey.

Rare observation of sea otter in Haro Strait, perhaps first since 2014.

Sleeper sharks are already known to range as far north as the Chukchi Sea, but reports of possible shark attacks on seal and sea lions have increased — and now come from further into the Arctic.

State officials are now blaming toxoplasmosis, a parasite carried in cat feces, for the deaths of three critically endangered Hawaiian monk seals on Oahu.

One whale-watched said it appeared to be a mother orca with a large dorsal fin and three to four young orcas.

Federal officials have shut down salmon and recreational fishing for the summer in key feeding grounds for killer whales. The closures, which took effect Friday, apply to parts of the southern . . .

Cook Inlet beluga whales are swimming up the Kenai River earlier in the year and in greater numbers than previously estimated, according to new monitoring of the endangered species.

The remains of a possible seal carcass tangled in netting may have come into contact postmortem, "ghost fishing" as a potential cause.

In the last 15 years, polar bear hunters in eastern Greenland have had to adapt their hunting practices because of climate change,

Northern sea otters, once hunted to the brink of extinction along Alaska's Panhandle, have made a spectacular comeback.

The first right whale of the season has been spotted in Canadian waters after an unprecedented winter in which not a single calf was spotted.

Sea ice has shrunk, but scientists are seeing signs that Alaska's bowhead whales are flourishing.