The Caribbean mammal with grooved lower incisors for delivering toxic saliva is the solenodon.
Solenodons are nocturnal, burrowing insectivorous mammals found in the Caribbean. Two living species are recognized: the Cuban solenodon, Atopogale cubana, and the Hispaniolan solenodon, Solenodon paradoxus. Their name comes from Greek words meaning “channel” or “pipe” and “tooth,” referring to their unusual dental grooves.
Modified submaxillary glands produce toxic saliva, which flows through grooves in the second lower incisors. This makes solenodons one of the very small number of venomous mammals. Their venom contains kallikrein-like proteins that can affect blood vessels and blood pressure, helping subdue prey.
The answer is the genus name, not a single species, because both living solenodons share this venom-delivery adaptation. They are often mistaken for oversized shrews, but solenodons belong to their own family, Solenodontidae. Habitat loss and introduced predators such as cats, dogs, and mongooses threaten their island populations.