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Gray whales have unique markings, making it possible to track each one in the bay. Jane Tyska/Digital First Media/East Bay Times via Getty Images

Gray whales are dying in San Francisco Bay at an alarming rate – this isn’t normal

In the past, the gray whale population recovered fairly quickly. But data on baby whales show that isn’t happening, and a new study finds an alarmingly high mortality rate.
Researchers believe a decline in seagrass is leaving manatees malnourished. Dave Fleetham/Design Pics Editorial/Universal Images Group via Getty Images

Untreated sewage and fertilizer runoff threaten the Florida manatee’s main food source, contributing to malnutrition

Manatees along Florida’s coast are eating less seagrass and more algae than they did a few decades ago. This dietary shift could pose a new threat to the survival of the beloved species.
Blue whales and orcas are both specialists in their own way. You can’t really measure which one is more intelligent. Shutterstock

Curious Kids: which is smarter – a blue whale or an orca?

We don’t know for sure which one is smarter, because not everyone agrees on what “intelligence” means. Both have their own special behaviours and skills and we can’t say who is more intelligent.
Mai Lam/The Conversation NY-BD-CC

Curious Kids: Why do sea otters clap?

Sea otters can break the shell on a shellfish by hitting it against a stone resting on their belly. This can look like clapping. Some even have a favourite stone they carry around in their armpits.

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