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Solenodon

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The solenodon is a unique group of venomous, nocturnal mammals. They belong to the family Solenodontidae. These animals are famous for being "living fossils." This means they have remained virtually unchanged for 76 million years.

Solenodon cubanus
Solenodon cubanus

Today, only two living species remain. The Cuban solenodon, or Atopogale cubana, lives in Cuba. The Hispaniolan solenodon, or Solenodon paradoxus, lives on the island of Hispaniola.

Hispaniola solenodon
Hispaniola solenodon

These mammals are important to their ecosystems. They help control invertebrate populations and spread fruit seeds.

Solenodons possess a highly specialized method for delivering venom. Their name comes from the Greek words for "channel" and "tooth." This refers to the grooves on their second lower incisors. These grooves act like tiny pipes for their saliva. The venom is produced in enlarged submaxillary glands in the jaw.

Solenodon paradoxus skul
Solenodon paradoxus skul

When they bite, the venom flows through these grooves into the prey. The venom contains proteins called kallikreins. These are serine proteases that prevent blood from clotting. This causes hypotension, which is a drop in blood pressure. In lab studies, large doses have caused death in mice.

Solenodon cubanus Zoothèque MNHN
Solenodon cubanus Zoothèque MNHN

These animals have several distinct physical features. They resemble very large shrews with long, flexible snouts. The Hispaniolan species has a ball-and-socket joint at the base of its snout. This joint increases mobility so they can probe narrow crevices for food. They have long, naked, scaly tails and hairless feet. Their eyes are very small, giving them poor vision. To navigate, they use echolocation. They generate clicking noises that bounce off nearby objects.

Solenodon cubanus
Solenodon cubanus

Scientific research has changed our understanding of solenodon history. For a long time, scientists thought they were related to tenrecs. However, genetic analysis in 2016 provided new evidence. This study confirmed they belong to an evolutionary branch that split from the lineage of hedgehogs, moles, and shrews. This split happened before the Cretaceous-Paleogene extinction event. Molecular data suggests they diverged from other living mammals about 73 million years ago. They are one of two families of Caribbean soricomorphs. The other family, Nesophontidae, became extinct during the Holocene.

Solenodons have specific habits for survival and reproduction. They are solitary animals that rarely interact outside of breeding. Females give birth to one or two pups in a nesting burrow. The nursing period lasts about seventy-five days. The young stay with the mother for several months. During this time, they cling to her elongated teats. These teats are located near the back of the animal.

Hispaniola solenodon
Hispaniola solenodon

In the wild, their lifespan is not fully known. However, Hispaniolan solenodons have lived up to eleven years in captivity.

Finding solenodons in the wild requires careful observation. They are nocturnal and hide in caves or logs during the day. Researchers look for specific clues to find them. One clue is a nose-poke hole in the ground. The solenodon uses its long nose to probe for insects. Another clue is a strong, musky, goat-like odor. This scent comes from glands in their groin area.

Solenodon cubanus
Solenodon cubanus

Researchers also look for scratches on logs made by their sharp claws.

Despite their ancient history, solenodons face modern threats. Habitat destruction from human development is a major problem. They also face predation from non-native animals. Humans introduced cats, dogs, and mongooses to the islands. Mongooses were originally brought to control snakes and rodents. These introduced species threaten the survival of both living species. Two other species, the giant solenodon and Marcano's solenodon, went extinct recently. They likely disappeared due to predation by introduced rats. Protecting their forest homes is vital for their continued existence.

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🖼️ Images & Media (4)
File:Hispaniola solenodon.jpg
Hispaniola solenodon.jpg
File:Solenodon cubanus Zoothèque MNHN.jpg
Solenodon cubanus Zoothèque MNHN.jpg
File:Solenodon cubanus.jpg
Solenodon cubanus.jpg
File:Solenodon paradoxus skul.png
Solenodon paradoxus skul.png
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