title: Testicular regression in relation to incubation effort in a tropical cuckoo.
mesh_terms: D000818:Animals; D001717:Birds / Q000033:anatomy & histology*; D005260:Female; D008297:Male; D009425:Nesting Behavior / Q000502:physiology*; D010058:Oviposition; D010332:Paternal Behavior; D012726:Sexual Behavior, Animal / Q000502:physiology*; D012930:Social Dominance; D013737:Testis / Q000033:anatomy & histology*