I thought it was interesting that this ant and the ants I entered in another observation (https://www.inaturalist.org/observations/86365200) were in exactly the same place. I didn't see them interacting but I suspect they were. I thought they might just be color morphs of the same species.
Hormiga
Lugar: Barrio Caimito, localizado en San Juan
Descripción morfológica:
Coloración negro-rojizo y aproximadamente 0.5 pulgadas de tamaño.
Observada alrededor de las 12:40pm.