Bark bark yip yip!

why do some of my gliders (2 gliders in particular of my 7 total) bark continuously, sometimes up to 1 hour without stopping, even if the other 6 gliders or I are right near it? Sometimes one will get going and just wont stop, not even for food or treats. This happens a few times a week. Also, why those two individuals? The other five never bark and all 7 gliders are well bonded not only to to each other, but also us.

I have no idea why they would be barking like that -- hopefully someone will come along and offer a better reply.

Our 2 boys are usually pretty quiet, unless they are trying to get my husband to give them treats! They seem to have him well trained! LOL