Bentar Wagons
The reason bentar wagons are so popular on New Earth is because the birds are much smaller than cattle, are quieter, eat less, poop less and move slower. The wagons are smaller and while one bird has a limited weight it can pull, two does a good job. Bentar are generally tame, easy to handle and there is no fear of being stepped on or pushed over. Most humans prefer the bentar, looking upon the cattle as monsterous, good for meat and giant wagons, but not everyday travel.