This rat’s poison can kill an elephant | Pets-animals News

Meet the African crested rat (Lophiomys imhausi), a rodent roughly the size of a small cat, about 360-530 mm long (head to tail) and weighing around 1 kg.
It’s the only known mammal that acquires poison from a plant for defence. As researchers have confirmed, it chews the bark of the Acokanthera poison-arrow tree, then transfers a mixture of toxins and saliva onto specialised hairs on its flanks. According to a Wildlife Conservation Society news release from 2011:
“In the only known instance of a mammal acquiring a lethal toxin from a plant for defence, the researchers have discovered where the African crested rat … gets its poison: the Acokanthera tree, the same source used East African hunters for poison arrows.”
The discovery was made Jonathan Kingdon and his colleagues from the National Museums of Kenya, the Wildlife Conservation Society, and the University of Oxford, and published in the Proceedings of The Royal Society B.
Those hairs aren’t ordinary fur; they’re sponge-like and hollow, with perforations to rapidly absorb the toxin, “like candle wicks”, and hold it in place.
Scients have explained that the cardenolide toxins (such as ouabain) extracted from the tree bark are the same used in poison arrows for hunting elephants, hence the comparison. (Source: Wikimedia Commons)
When threatened, the rat stands its black-and-white mane upright, revealing the poisoned stripe along its sides. This display acts both as a warning signal (aposematic colouration) and a chemical deterrent.
“The African crested rat is a fascinating example of how a species can evolve a unique set of defenses in response to pressure from predators,” Dr Tim O’Brien, Senior Scient of the Wildlife Conservation Society and a co-author on the study, said in the press release. “The animal and its acquired toxicity are unique among placental mammals.”Story continues below this ad
Scients have explained that the cardenolide toxins (such as ouabain) extracted from the tree bark are the same used in poison arrows for hunting elephants, hence the comparison.
But remember: this isn’t a venomous bite. Instead, the toxin enters through contact, poisoning the predator if it tries to bite or grab the rat.
Adaptations & defense mechanisms
Despite coating itself in poison, the maned rat remains unharmed. Its ceramic-like cranial bones, thick skin, and vertebrae provide physical protection. How it avoids self-poisoning remains partly a mystery, scients speculate it may involve its salivary proteins or gut enzymes.
It lives in East Africa, in regions like Kenya, Uganda, Somalia, Tanzania, Ethiopia, and Sudan. It prefers rocky forests and savannahs, nesting in hollow logs or burrows.Story continues below this ad
It’s led as Least Concern the IUCN, though habitat degradation is noted.