Scientists off the coast of Washington state filmed a pod of over 20 Southern Resident killer whales. San Diego Zoo Wildlife Alliance told CNN their researchers, alongside SeaDoc Society and NOAA, are using "non-invasive health monitoring technologies" to study threats to the endangered species. | CNN

Extraordinary footage shows a scientist’s too-close-for-comfort encounter with a killer whale earlier this month in the waters of Antarctica https://cnn.it/2E6nYDN | CNN

This killer whale learned how to imitate human speech by repeating a handful of words including “hello,” “bye bye,” “one, two” and “Amy” http://cnn.it/2BIDulY | CNN