I've noticed that too - maybe it's because animals are usually so upbeat. Know what I mean? I have some pics of Doc playing rough in the house with a ball and the orbs were everywhere while he was playing!
I think they like excitement - they seem to show up in force on Christmas Eve during the present opening too.
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Or if music is being played; any time there's lots of positive energy in the air. Perhaps when there is neagative energy too? (i.e. during arguements) I think they're interested in whatever excitement is taking place in the house.
Kell