World Penguin Day is this Saturday (April 25, 2020), and two new residents of the Dan and Vi McKinney Penguin Habitat at the San Diego Zoo are starting the weekend celebration early by practicing what penguins do best—swimming.

Scientists at San Diego Zoo Global’s Frozen Zoo® have achieved a major milestone in saving wildlife species: This unique collection of genetic material now contains 10,000 individual cell lines from more than 1,100 species and subspecies—some of them critically endangered.