Keepers at the Smithsonian’s National Zoo’s Reptile Discovery Center spotted it during a routine checkup—a small, discolored bulge on the neck of the 4-year-old Henkel’s leaf-tailed gecko.

On Oct. 18, the Smithsonian ... House and Reptile Discovery Center. Guests will also receive a souvenir tote bag to collect goodies from trick-or-treating stations throughout the zoo.

Keepers at the Smithsonian’s National Zoo’s Reptile Discovery Center spotted it during a routine checkup—a small, discolored bulge on the neck of the 4-year-old Henkel’s leaf-tailed gecko.