THEN off to insects! Like those Giant Bees/Wasps.
Vespa mandarinia are scary enough and they're an extant species o_o;
Also split up Cenozoic that is too broad a seperation as it both includes
A) Wolly Mammoths, Terror Birds, Dire Wolves
and
B) The Dodo Birds, Passanger pigeon, and really any recently extinct animal.
The Dodo bird doesn't have the same context when we reflect upon it then the Wolly Mammoth.
-This also contradicts your statements on "Extinction" unless you plan to move the Extinct animals that don't fit there anymore. Like the Auroch who went extinct AFTER the medieval times.
I'm thinking that the subgroups can be further split however we deem appropriate so somebody that wants a game full of dinosaurs walking the Earth can get a pack of that but somebody that cringes when they think of Trex walking around with dinosaurs from earlier periods can get a more specific one to install that won't grate on them (much?)
Someone did add tardigrades already -- that'll probably have to be removed.
Maybe you could just convert them to megabeast only- they'd be pretty cool in that form n_n
Well really most things with exoskeleton type bodies (*jointed appendages) make great megabeasts.
As for the color/colour conundrum, why don't you simply release two versions? It would be a hell of a lot more user-base friendly that way (Americans aren't the only people who play DF).
You can go into the raws and change spellings if you want. With a good word processor you can even replace ever instance of color with colour by typing those both out and clicking just the once per file.
Since this is a wiki-type project you shouldn't just tell other people to do something you could easily do and submit for public use~
If not I'll go ahead and PM Rainseeker to lock this thread.
Ooh, looks like I'm last minute posting.