We have been discussing whether the intruder is a male or female. I originally thought it was a female, based upon the zoomed in cam view, and views from the ground. Now that the cam has been zoomed out, it appears the intruder is smaller than Belle in several videos that have been posted. Here is a comparison of Liberty and the intruder, perching on the same branch at different times on Sunday March 21. I thought the intruder was a female at first, but it looks to me like the intruder is a male as the two are very comparable in size. Thanks to Lori O for sending me the pictures for this comparison.