Carp.
If you've been playing DF for over a month and a half, you knew carp. You feared carp. If you weren't incredibly careful, you'd have an aquatic massacre on your hands. Carp could;
-Survive on land for a disproportionately long time.
-Deal three times the damage of an unarmed dwarf.
-Flat-out haul your thirsty dwarves into the depths to drown them.
Carp were the worst kind of vicious animal, because where there was one, there were another twenty. I don't care to count how many fledgling fortresses I had crumble on me due to forgetting to do everything in my power to make my dwarves not go near the water. However, as we all know, Toady scaled back their damage, made them less populous, and most importantly removed that incredible tendency for violent aggression they had. Now, carp are mostly docile creatures who, it seems, only really attack in self-defense, preferring instead to swim away. They're now just another type of wildlife.
Be all this as it may, I sort of miss our old aquatic foe. It's great that what might have been a great bastion of dwarven civilization isn't being undone in its infancy by a school of overgrown tuna, but without carp as a threat, I feel like there's no reason to avoid freshwater rivers and lakes anymore. It removed some of the arbitrary, almost superstitious sense of danger I got when mucking about redirecting rivers and draining lakes to suit my whims needs.
Am I the only one who thinks like this?