The secret social lives of giant poisonous rats

The African crested rat is the only mammal known to sequester plant toxins for chemical defense. A new study confirmed that the rabbit-sized rodent licks poison from the bark of Acokanthera schimperi, known as the poison arrow tree, into specialized fur. The researchers also discovered an unexpected social life -- the rats appear to be monogamous and may even form small family units with their offspring.

source https://www.sciencedaily.com/releases/2020/11/201119135403.htm