Sea lion joins children's walk-a-thon

Children at an elementary school near the San Francisco Bay recently got a surprise. While participating in a walk-a-thon set up on the school grounds, they were suddenly joined by a sea lion who not only watched them exercising, but decided to join them himself -- doing an entire lap!

Though the encounter had to thrill the school children during their fitness event, it's an unfortunate turn of events for Astro, as the sea lion is named. Well known by the Marine Mammal Center, who raised him after his mother abandoned him, Astro keeps turning up despite being released to the wild again and again. His close contact with humans as a baby has made him unable to thrive in the wild, and he'll now live out his life in a zoo-type environment.