I'll refresh this topic since I have something to add :D
Animated Snowman you can resp every 5 min - that's a fact. I agree that in group of, for example, 10 people it is much faster, exactly 10 times faster, but 500 minutes to complete bestiary isn't satisfactory solution. At least in my opinion.
Me and my friends finished it much faster, in about 2 hours.
We did it in a group of 8 players (more people killed Snowmans too fast and part of us weren't able to hit each Snowman) but 2 players had 20 8-lvl characters to relog and use carrots on a giant snowball. You have to know, that this cooldown runs even if your character is offline, that's why with 20 chars you don't have to wait, you simply relog on another char and after 5 minutes the first one is ready again to use the carrot.
Additionally each of you have to use one carrot every 5 min.
As other guys mentioned: you have to bring a lot of carrots and snowballs to make it as fast as possible.
From m own experience players rather help than disturb - we did it next to the boat.