Birds may refine their songs while sleeping.
Barinaga
M
M
D000818:Animals; D005246:Feedback; D007858:Learning / Q000502:physiology*; D008297:Male; D009434:Neural Pathways; D009474:Neurons / Q000502:physiology*; D009638:Norepinephrine / Q000378:metabolism; D016548:Prosencephalon / Q000502:physiology*; D012890:Sleep / Q000502:physiology*; D020308:Songbirds / Q000502:physiology*; D014828:Vocalization, Animal
D009638:Norepinephrine