Soils here are also limestone derived and outcroppings and fissures are abundant. Quite different environmental conditions are required for each. Adult toads are semifossorial and are widely dispersed when not breeding. Adults may be found in limestone fissures, under limestone boulders, and in cavities. Although not completely understood, breeding in Guanica is sporadic and dependent upon occasional heavy rains.
Breeding is known to occur at two coastal sites which flood when sufficient rainfall is received.
In the Quebradillas area Peltophryne lemur has been observed breeding in permanent cattle watering troughs. Guanica Forest is a coastal forest in the southwestern part of Puerto Rico. Seven vegetation associations have been identified, containing a total of more than 700 species of plants. The Forest is underlain by limestone sedimentary rocks, Tertiary in origin. Marine fossils are abundant.