A beloved beluga whale with a mysterious past was found dead in the waters of Norway over the weekend. Admirers are paying tribute as authorities investigate.

Hvaldimir unexpectedly headed south after several years in Norway, fueling concerns and efforts to bring him to safety. Experts say his story shines a light on how humans treat animals in general.

A 20-year-old whale named Whisper gave birth to a calf May 17 at the Georgia Aquarium, officials said Monday.

Whale economics: it’s something you’ve got to think about if you’re running a facility like the Georgia Aquarium. They spent $6.5 million over four...