Wild Ferrets wiped out by Plaque

Only one ferret was seen after a sylvatic plaque raged through the population. Scientists tried to innoculate the ferrets with peanut butter laced pellets, but the vaccine failed. 24 ferrets were lost.

https://www.npr.org/2017/12/10/569468428/biologists-with-drones-and-peanut-butter-pellets-are-on-a-mission-to-help-ferret

Refuge’s ferrets wiped out after plague strikes prairie dogs