The animal world celebrates the onslaught of fall this week, with Halloween pumpkins, dips through autumn leaves, and a hunting season mystery -- plus dolphins teaching each other to dance, an invincible black rhino, and more.
Lion Cub Learns to Swim
Keepers at the National Zoo
gave four eight-week-old cubs
their first swimming lesson this week, testing their progress to guarantee that the cubs will be safe near the water when they join their parents on display in late December.
Photo: AP Photo/Jacquelyn Martin