Centaur no Nayami. It's only a monster girls series on the surface. They're not really hiding the fact that it is about racism. There's a dark undercurrent to the series as well, where acceptance is strictly enforced by law after centuries of worldwide discrimination, slavery, and abduction and rape.
They're all "humans," (the extra "limbs" which include extra legs like the centaurs or horns for the satyrs) and while they can interbreed, but there are hints that hybrids are not healthy, unless the features of one of the parents bred true.
Overall, the plot of each episode is really light-hearted slice of life stuff laid on top of the darker backdrop. It's interesting from that aspect, but the primary plots are the regular school anime tropes you've seen a million times.
Also, that the centaurs wear pants really bothers me, and the winged people have pretty small holes in their shirts. The series focuses so well on all the other anatomical and biological issues that monster people would have in society (furniture, bathrooms, beds, vehicles, etc), but totally falls flat on clothing. Practical clothing was something that Monster Musume did far better.