Twin otters Boldt and Lawrence at Riverview Park and Zoo turn four on Tuesday.
Both male otters came to RPZ in 2019 from the Aquatarium in Brockville.
They joined two river otters already living at the zoo, Splish and Melissa.
RPZ’s outdoor otter exhibit opened in 2007 and has two pools, a waterfall and a slide, as well as outdoor land areas for the animals to roam, play and hide.
The boys celebrated their birthday in their icy cold pool at the zoo.
River otters have two layers of fur that protect them from cold water.