My version of Glorantha contains 27 unique herd animals associated with Prax and/or the Wastes. Your Glorantha probably is different, but if not, we must blame Trickster.
I welcome any thoughts on the matter, but please, be gentle.
Many of these animals are extant, some only remembered, and others we no longer consider. Some are better, some lesser, and a few are quite different. Of course, this much interpretation, lazy memory, moderate modification, and wild speculation yields imperfect results, and this list is probably imperfect, and for that we must blame Trickster. They are offered below in no particular order. Subject to change as knowledge increases.
Extant - the "now", of most Gloranthan settings.
Rhino
Horse
Unicorn
Zebra
Antelope
Bolo Lizard
Ostritch
High Llama
Morocanth - they keep Herd-Men, and thus are unique
Impala
Sable
Bison
Donkey - herd beast of the Cannibal Cult it seems
Bird Lizard - probably same as Bolo Lizard, but different in my Glorantha
Lion - lions, and other Basmoli, are no longer herd beasts in my Glorantha
Animals remembered only in the “now”, but we have some information, be it true or otherwise. Subject to change as knowledge increases.
Camel - associated with a Trickster prank involving Genert if I recall correctly
Eight-Legs - big spiders and an Uz tribe I assume, and Humans perhaps……
Plains Elk - known to be true, we think.
Nose-Horn - it seems the “real” name if forgotten. Or is it?
Long -Ears - see above
Long-Nose - see above
Horn-Nose - see above
Antler-Head - see above
Rib-Hide - see above
Some herd animals are no longer known, and even their names are gone. In my Glorantha, I declare the remaining Praxian herd animals that once existed, and that might be encountered in the Other Side. Subject to change as knowledge increases.
Cow - they are relatively common in Genertela I gather, and Uralda lives nearby.
Pig - see above, different goddess
Buffalo - of course little, but bigger, brother to Bison, and apparently not as stout