Last winter I had the opportunity to watch a Long-tailed Weasel (Mustela frenata) make the transition from her white winter coat to her brown and yellow summer coat. This entire transformation took less than three weeks.

The spring moult coinsides with the beginning of embryonic development of her young. Long-tailed weasel mate in late spring to early summer, but the fertilized eggs don’t start to develop until the end of winter. The gestation period is 10 months total but actual embryonic development only occurs in the final 4 weeks. I mention this because this little girl began to cache food like it was the end of the world. She would hunt non-stop for hours. I watched her bring back over 30 rodents to the den.

If you haven’t seen a Long-tailed Weasel in person, they are quite small. The females are about 12″ long including the tail and males are a bit larger at about 14″ long. Long-tailed Weasel are fearless predators that will take down not only rodents, but snakes, lizards, birds and even cottontail rabbits! I personally have only seen them with rodent prey.

I love these ferocious little hunters and take the opportunity to photograph them whenever I get the chance.

Thanks for taking the time to look at my photos. Enjoy.