Guiraca, [585]Gula, [20]Gull, [49], [148], [268], [300]-[304];habits, [302] f.;Black-headed, [308];Bonaparte's, [302], [309];Common, [307];Glaucous, [304], [306];Great Black-backed, [301], [302], [307];Great Black-headed, [309], [309];