Premigratory increase in circulating triiodothyronine/thyroxine ratio in the red-headed bunting (Emberiza bruniceps).
D000818:Animals; D001522:Behavior, Animal / Q000502:physiology; D001717:Birds / Q000097:blood* / Q000502:physiology; D008297:Male; D012621:Seasons; D013961:Thyroid Gland / Q000502:physiology; D013974:Thyroxine / Q000097:blood*; D014284:Triiodothyronine / Q000097:blood*
D014284:Triiodothyronine; D013974:Thyroxine