been researching genetics and noticed humans and chimps are much nearer chromosomewise than many species that successfully breed hybrids so, even tho ive always heard humans cant hybrid with any nonhumans, i looked in to it and found this interesting thing.
“Complexities and partial sterility pertain to horse–zebra hybrids, or zorses, whose chromosomal disparity is very wide, with horses typically having 32 chromosome pairs and zebras between 16 and 23 depending on species.”