Extreme monotremes.
Choi
Charles Q
CQ
D000220:Adaptation, Biological; D000818:Animals; D005075:Biological Evolution; D005580:Fossils; D010987:Platypus / Q000033:anatomy & histology / Q000235:genetics / Q000502:physiology*; D004442:Tachyglossidae / Q000033:anatomy & histology / Q000235:genetics / Q000502:physiology*