The whale, a 23-year-old female named Peekachu, died suddenly Tuesday
Six gray whales have died in the San Francisco Bay in just the past week alone, bringing the total number of stranded whales to 15 so far this year as authorities rush to figure out what could be causing the sudden deaths.
From solar panels over canals to fashionable clothes with zero waste, watch "ourHome: Earth Month" to learn about conservation efforts near you and across the country.
A veterinarian determined the whale was lethargic, in thin body condition, and congestion was heard in the lungs.
David Gruber, National Geographic Explorer and founder of Project CETI, discusses how AI is helping researchers decipher whale calls.
The known population of the whale species is just 360, making it one of the most endangered large whales in the world.