Intelligent and trainable
Ferrets are far more intelligent than most people give them credit for. My two sable ferrets have learned their names, come when called (most of the time), and one has learned to sit for treats. They understand cause and effect in a sophisticated way — they know which drawer has the treats, which cabinet has their leads, and which sounds mean "free roam time." Their problem-solving is genuinely impressive and endlessly entertaining to observe.
Sable Ferret