<p>Oregon Zoo’s river otter pups were swimming smoothly on their own as seen in a video published on May 15.</p><p>The zoo said pups Nellie and Tucker “have graduated from otter swim school” around a month after they started to take the plunge</a> with the help of their mother, Tilly.</p><p>Despite being naturally buoyant, otter pups need help learning to swim.</p><br />
