This year, the Zoo marks the 21st year of its free-ranging GLT program. In June, a GLT family was released in Beaver Valley for the summer. The family includes a male, Eduardo, and a female, Laranja, who were free-ranging last summer, plus their female twins, who were born in March. The outdoor exhibit includes a nest box, ropes that mimic the jungle vines of the tamarins' native Brazilian forest habitat, and food stations. Learn more.