The whale's pod hasn't had a single viable pregnancy over the past three years.
Dolphin societies are surprisingly complex.
The sea mammals were being trained in a Soviet-era facility in Sevastopol that breeds marine assistants for the navy.
The dolphin is still in critical condition.
Technically, dolphins are whales, and whales are more closely related to cows than sharks.
The ancient marine mammal could help explain when North and South America first joined.
The annual dolphin slaughter is similar to American cattle slaughtering, said a representative.
This bulbous-headed animal had to learn to fit in with her sleeker cousins.
If Katrina is anything to go by, 2019 will be a good year for baby dolphins.
The dolphins are threatened by habitat loss and ship strikes.
The controversial hunt captures dolphins for butchering and aquariums.
The trainer and his family received death threats, according to his employer.