A pup shown at 1 day old;
at birth, a North American river otter is born with its eyes closed.
Posted March 2022
The zookeepers from Small Mammals, who are carefully tending to the pups since birth, have given them names! In keeping with the Irish theme (Mom Shamrock was born on St. Patrick’s Day in 2017) the names are: Evie for the girl, Cedrick, Corky and Bailey for the boys.
The Milwaukee County Zoo is excited to announce the birth of four North American river otter pups born February 7! Three male and one female pup were born to mom, Shamrock, and dad, Malarkey (Larkey). This is the first surviving litter for the pair.
So far, Shamrock is displaying excellent maternal care toward the pups. Animal care staff comment that she’s extremely attentive and stays with the pups nearly every hour of the day, in an off-exhibit holding area. She cleans and grooms the pups and has even been seen bringing her food into the area to be close to them.
The four pups snuggle together.
While the Zoo’s other female, Clover, and male, Larkey, remain in the outdoor habitat, Shamrock and the pups are living together (the pups are usually curled up in a ball next to each other), in the indoor maternity den, with soft, natural bedding material for warmth and comfort. The den consists of several separate habitat areas, or compartments, for Shamrock to easily move the pups from one area to the another if she decides.
One of the compartments has a nest box, and the entire den, or suite, is quiet, with additional heat and humidity to keep the pups comfortable in their first weeks of life.
At 1 week old, animal care staff check the teeth of an otter pup.
Because this marks the first successful litter, zookeepers are careful to keep a consistent daily routine for Shamrock, so there is no distress during her days and nights. The pups are weighed daily, always at the same time. At birth the pups weighed ~125 grams each, and have continued to gain weight every day since. Keepers closely monitor mom and the pups and report they appear to be healthy and developing well.
Shamrock is nursing the pups, who should be fully weaned at 3-4 months. In 42-56 days, they’ll begin eating fish that the keepers will “mash” for them, or fish that Shamrock drops from her mouth! North American river otter pups are born with their eyes closed, and they’ll remain closed until about 1 month old.
One of the pups at 2 weeks old.
As the pups continue to grow and mature, keepers are noticing some “squirming” and “belly crawling” in the holding areas. At times, Shamrock may leave the pups for a very short period during the day for a quick swim in the indoor holding pool, but she immediately returns to them afterward. She takes her swim only after nursing the pups.
Keepers say they usually see the pups nestle together and sleep many hours of the day. It’s expected the pups will learn how to swim from mom, at about 1 ½ months old. They will walk first, and then learn how to swim in the indoor pool.
The new arrivals marked their 1-month birthday March 7, and Shamrock and the pups, who have yet to be named, will remain off-exhibit for the next few months. Animal care staff are keeping a watchful eye on them, and the Zoo will regularly update visitors on their progress.