The Puerto Rican Crested Anole (Anolis cristatellus) is a small, arboreal, trunk-ground lizard that is native to Puerto Rico and the Virgin Islands.
Males are characterized by a prominent, fin-like tail crest (clearly visible on the 1st photo).
The Puerto Rican Crested Anole is light brown in color and both males and females have varying patterns of dark brown on their backs including mottled coloration, hourglass (bow tie) patterns (3rd photo), and longitudinal stripes (5th photo).
It is endemic to Puerto Rico and the Virgin Islands but through the pet trade it now also occurs in several places outside of its native range such as in Miami (Florida), Dominica, Costa Rica, Mexico (Yucatan), Trinidad, Saint Martin, and the Dominican Republic.

The Puerto Rican Crested Anole may be confused with the similar looking Gundlach's anole (Anolis gundlachi) that also occurs on Puerto Rico. 
Anolis gundlachi can be distinguished from the Puerto Rican Crested Anole by the yellow-tipped chin, blue eye, and solid yellow dewlap.
As a general rule, Anolis gundlachi occupies shady forests while the Puerto Rican Crested Anole inhabits sunny open fields and roadsides alongside the forest.

1st photo: Boquerón National Park area, Boquerón, Puerto Rico, 18 January 2026
2nd photo: Bosque de Pinones Nature Reserve, Puerto Rico, 23 January 2026
3rd photo: Rio Abajo State Forest, Puerto Rico, 16 January 2026
4th & 5th photo: Humacao Nature Preserve, Puerto Rico, 21 January 2026