D&D 3.x Prehistoric animals

[Knight Otu]

They're medium.

 

[Knight Otu]

Added to list. And if BOZ or someone else can list the dinosaurs in Tome of Horrors, I'll add them to the list.

I think those are fitting:
ToH:
Bonesnapper - basically a mini-T Rex
Axebeak and Clubnek - flightless birds

ToH II:
Cave Lion
Hyaenodon
Mammoth
Mastodon
Wolly Rhino
Smilodon

 

[Knightfall]

I think those are fitting:
ToH:
Bonesnapper - basically a mini-T Rex
Axebeak and Clubnek - flightless birds

ToH II:
Cave Lion
Hyaenodon
Mammoth
Mastodon
Wolly Rhino
Smilodon

Updated, except for the Bonesnapper. That is, specifically, a Greyhawk creature. (Just my personal opinion.)