My "Mammals of Alberta" (lone Pine) lists Least Weasel at 6 to 9 inches total length including the tail and in their words
Quote:
The short tail may have a few black hairs at the end but never an entirely black tip
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They list short tailed Weasel at 8 to 13 inches.
To the best of my knowledge, with all members of the Weasel family, males are always larger, except when very young.
I know that by six weeks of age there is a noticeable size difference in short tailed Weasel. I know because when I was around 14 years old we rescued a litter of Weasel kits and raised them.
"The Natural History of Canadian Mammals" (Canadian Museum of nature) says this about the male/female body size relationship in members of the Weasel family.
Quote:
Males are larger then females in all forms.
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I agree that what you have is a Least Weasel but size is not a fixed thing with members of the
Mustela genus which includes the Least Weasel.Members of that genus can very considerably between members of the same species plus a large Male Least can easily be as large as a small female Short tailed.
To the best of my knowledge I have never caught a Least Weasel but I have caught a few Weasels around 6 inches total length. I even had to build a special stretcher for them because they were too small for the stretchers I build from SRD patterns.
I remember wondering each time I caught one if it were a Least but each one I caught had an all black tipped tail so I decided they were smaller then average, maybe late litter juvenile female short tailed Weasel.