Sharks and penguins living together at Cal Academy

SAN FRANCISCO

Six pyjama sharks were released into the Steinhart Aquarium Tuesday morning, joining a colony of African penguins. Biologists say not to worry. The seemingly unlikely housemates co-habitate in the wild along the South African coast.

The pyjama sharks are nocturnal bottom feeders and shy by nature, while the penguins fish in shallow waters during the day.

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