Turns out grey whales are dying from ship strikes and starvation, human-caused eradication of an ancient species.
Their traditional food source is becoming scarce in the summer arctic feeding grounds due to rapidly deteriorating environmental conditions. Because they are hungry when they head back to California, they deviate from migratory patterns and come into contact with ships resulting in death.
Another symptom warning us about our own fate if we don’t address global warming fast.
For a slightly more in depth analysis: