Proto-Ynnin lived in herds of about twelve to forty females and young. During mating, matrifocal herds dissolved as males competed for prime territory, displayed and gathered temporary brood herds. As omnivores they ate grubs and scavenged meat as well as scrub and grass.
Ynnin seem earnest and fanatical but scrupulously fair, but they can also be very idealistic. They have become excellent ecologists, an aim that permeates their culture. Often serve individual Thennanin as bodygurads and administrative aides.