Sheep belong to the genus Ovis and have 54 chromosomes, while goats belong to the genus Capra and have 60 chromosomes. The offspring of a sheep-goat pairing is generally stillborn. Despite widespread shared pasturing of goats and sheep, hybrids are very rare, indicating the genetic distance between the two species.
Indigenous people of Mexico and Central America used the Nahuatl word āhuacatl to mean both “testicles” and “avocado.” The fruits were originally marketed as “alligator pears” in the United States until the current name stuck. For more random facts, learn what the original word for avocado means about guacamole’s name.