Yellow-footed Gull

Here the details of the Yellow-footed Gull named bird below:

SCI Name:  Larus livens
Protonym:  Larus occidentalis livens Proc.Biol.Soc.Wash. 32 p.11
Taxonomy:  Charadriiformes / Laridae / Larus
Taxonomy Code:  yefgul
Type Locality:  San Jose Island, Lower California.
Author:  Dwight
Publish Year:  1919
IUCN Status:  Least Concern

DEFINITIONS

LARUS
(Laridae; Ϯ Great Black-backed Gull L. marinus) L. larus  rapacious seabird, probably a gull  < Gr. λαρος laros  voracious seabird, perhaps a gull; the Great Black-backed Gull, the largest member of the Laridae, breeds only on sea coasts, where it is a true predator; "69. LARUS.  Rostrum edentulum, rectum, cultratum, apice declive: Mandibula inferior infra apicem gibba.  Nares lineares, antice latiores.   ...   Pulli primi anni plurumque in his grisei sunt; unde speciei multiplicatio." (Linnaeus 1758); "Larus Linné, Syst. Nat., ed. 10, 1, 1758, p. 136. Type, by subsequent designation, Larus marinus Linné (Selby, Cat. Gen. Subgen. Types Aves, 1840, p. 48)" (Peters 1934, II, 313). Linnaeus's Larus comprised six species (L. tridactylus, L. canus, L. marinus, L. fuscus, L. Atricilla, L. parasiticus).
Synon. Adelarus, Atricilla, Blasipus, Bruchigavia, Caturates, Chroicocephalus, Cirrhocephala, Clupeilarus, Dominicanus, Einalia, Epitelarus, Gabianus, Gavia, Gavina, Gelastes, Glaucus, Hydropeleia, Ichthyaetus, Lambruschinia, Laroides, Lencus, Leucophaeus, Melagavia, Melanolarus, Microlarus, Misamichus, Ocyplanus, Pacificolarus, Plautus, Procellarus.

livens
L. livens, liventis  bluish, black and blue  < livere  to be bluish.