#1 - Dec. 27, 2012, 3:22 p.m.
There is a bug with the ingame item, the Ogre Pet Whistle, in which the summoned creatures do not despawn appropriately.
[Bug] Ogre Pet Whistle
#12 - Jan. 2, 2013, 10:54 a.m.
Thank you for the reports! This has proven to be quite the complicated bug (it’s actually multiple issues on our side); so we don’t have an estimate on when it will be fixed yet.
I’m afraid you’ll have to keep living with the animals for a while. :P