Welcome to the Strelets Forum. Please feel free to discuss any aspect of 1/72 scale plastic figures, not simply Strelets. If you have any questions about our products then we will answer them here.
The US Army used mules to move wagons more than for 100 years. Typically we get horses in many sets. So pack mules are not exactly useful for that. It takes six mules to tow one wagon. In the Hat French Napoleonic Limber Set there are 18 horses enough to tow three wagons. I want a similar set with mules, rather than horses, that's just mules. No wagon drives, no limbers, just mules and lots of them. I think 24 mules is a reasonable number with 6 poses. Buying Strelets ancient sets to get four mules is not cost effective.
Andrillona of Petersburg do a nice range of paleolithic animals, mammoths, cave lions, megaloceros and are bringing out wolves, woolly rhinocerous and bears.
I would definitely buy sets of pack animals, cattle, and bison. (Separate sets, not combined.) I also like the idea of combined sets based of geography, although to be honest I would probably only buy a single set.