The mystery orcas are back in the Puget Sound. For the last few weeks, a pod of unfamiliar orcas has been coming and going ...

Orcas, also known as killer whales, are among the most well-studied marine mammals, captivating the public and scientists alike with their intelligence, strong social bonds and complex behaviors.

Learn how shifting ranges and new science show Southern Resident killer whales need other orcas more than we once believed.

Killer whales, also known as orcas, are easily recognized by their stunning black and white appearance. These huge animals can reach up to 26 feet long and are actually the largest members of the ...

The species Orcinus orca, generally known as orcas or killer whales, is made up of many genetically distinct populations called ecotypes. Each ecotype indicates an ecological specialization with its ...

A group of killer whales were spotted off the coast of California, boaters said. Getty Images/iStockphoto A group of orcas was spotted off the coast of California, leaving boaters “thrilled,” ...