Moose Sex Change? Anne Murray?

And excerpt from an article in The Calgary Sun:

Pet lawsuit not in cards

Three other animals, a female macaque, a moose the Sprungs kept penned up at
night for its safety, and a pet raccoon, which has since died, were also seized.
The moose, which the family erroneously believed was a male and dubbed Murray, was turned over to the Calgary Zoo
where her true sex was determined and she was renamed
Anne Murray.

I have to ask, what could have possibly made the owners think that the moose was lacking some particular parts (and with the average height of a moose being 6 to 7 feet at it's shoulders those manly parts would have almost literally been staring them right in the face).