Maybe the mom left? They said they kept putting him back in the water and he was so little he got stuck in the waves, so I suppose mom couldn't get to him either. He was too cute and it was so sweet to the see the babies today, after losing Oz previously, which made me cry. My elderly dog was having seizures months ago and I had to make the same decision to do the humane thing. It still hurts though.
I've only seen otters in the water so it was fun to see them, kind of seal-like, out of the water.
I really like this show too and enjoy how attached the keepers are. I'm always impressed by the ingenuity of everyone with training, testing, getting weights, etc.