Via The Transient Killer Whale Research Project:
"It is often difficult to ID killer whales. The elusive nature of transients compared to residents makes it hard for even the most experienced naturalist. I have been fortunate enough to encounter rare coastal transients in British Columbia waters. These transients often spend their time off the coastlines of California, Oregon, and Washington States.
Much is still unknown about their ecology and association between communities, as this behaviour is rarely witnessed.
Many people have requested a simple identification guide. Myself, Alisa Schulman-Janiger, Richard Ternullo, and Bernardo Alps collaboratively prepared a simple ID chart for coastal transients sighted in BC waters.
For sightings reports please email: firstname.lastname@example.org and email@example.com.
Posted by Josh McInnes"