Species of toad that are commonly found in Mesoamerica, like "Bufo marinus" or "Bufo valliceps", have the pronounced cleft in the head and, like all toads, have a fleshy mouth with toothless gums. These species of toad are known to have ceremonial and hallucinogenic properties for many cultures of Mesoamerica. Skeletal remains of these species, particularly "Bufo marinus", have been found at several archaeological sites in Mesoamerica including Olmec ceremonial centers. These species of toads have inherent symbolic power in their metamorphic life cycle, their fertility, their hallucinogenic venom, and especially their skin-shedding.