Brontotherium (the large gray Rhinoceros-like beast) and Daedon (the smaller brown warthog-like beast)
Megaloceros (sometimes called "Irish Elk")
All figures from Acheson Creations. Except for the daedon these critters are mostly resin, only the mammoth tusks, bull horns and forehead, and deer antlers/ears are metal. The daedon is a single-part metal miniature. These are a bit large for 28mm, probably more fitting for 40mm.