11. They share a similar fauna which includes marsupial and monotreme mammals and ratite birds. 12. Its eggs were probably small and leathery, a condition still found in monotremes . 13. The monotremes are the only group of land mammals known to have evolved electroreception. 14. Platypuses are a monotreme species whose mechanism of sex determination has been extensively studied. 15. Most recent phylogenetic studies validate this clade, lumping henosferids and aukstribosphenids alongside monotremes . 16. There is currently some debate regarding monotreme taxonomy. 17. Monotremes , like marsupials, produce larval young.18. The platypus is a monotreme , a mammal that lays eggs to hatch its young. 19. Subsequent monotreme molars are multi-rooted. 20. Modern monotremes have a low body temperature compared to marsupials and placental mammals, around.
