The Best Father's Day in D.C. (We Ain't Lion)

From a spunky new sloth to a dazzling electric eel, get ready to meet the newest residents making themselves at home.

Zoo staff are mourning the loss of Shera, a female African lion who was humanely euthanized May 7.

African lion Shera has been a protective sister, a bossy mate and a doting mother. After a life well lived, keepers are preparing to say goodbye to the matriarch of the Zoo's pride.