Why are sea lion pups crowding California’s shores?

Aired: 3/18/2015 | 0:00:50 | Clip
In our NewsHour Shares video of the day, a record number of sea lion pups have washed up on shore in Southern California. Some scientists think the warming waters and shortage of fish are forcing mothers to search longer for food, and marine mammal centers taking care of the hungry pups are nearing capacity.