"Otter pups are very dependent on their mother. They don't know how to swim right away, the mother actually has to teach them," said Julie Christie, the otters' lead keeper.
"Human parents often notice that the second child is much more independent," Christie said. "We are definitely noticing that with our second otter. He is way more independent than Mo was. Once Ziggy started walking, he has just been on the go. He's a little motorboat."
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And while it looks like Tilly is being tough on her little one, plunging him into the water, she's actually teaching him how to swim deeper.
"Tilly has been teaching Ziggy to do some deep dives," Christie said. "Otter pups are very buoyant, so it takes them a little bit to learn how to go underwater."
Watch Tilly teach Molalla to swim last spring here.