Animalia > Chordata > Aves > Charadriiformes > Laridae > Larus > Larus heermanni

Larus heermanni (Heermann's Gull)

Language: Spanish

Wikipedia Abstract

The Heermann's gull (Larus heermanni) is a gull resident in the United States, Mexico and extreme southwestern British Columbia, nearly all nesting on Isla Rasa in the Gulf of California. They are usually found near shores or well out to sea, very rarely inland. The species is named after Adolphus Lewis Heermann, nineteenth-century explorer and naturalist.
View Wikipedia Record: Larus heermanni

EDGE Analysis

Uniqueness Scale: Similiar (0) 
 Unique (100)
Uniqueness & Vulnerability Scale: Similiar & Secure (0) 
 Unique & Vulnerable (100)
ED Score: 1.83837
EDGE Score: 1.73638


Adult Weight [1]  1.10 lbs (500 g)
Birth Weight [3]  58.6 grams
Breeding Habitat [2]  Beaches and estuaries
Wintering Geography [2]  Pacific Coast
Wintering Habitat [2]  Beaches and estuaries, Coastal marine
Diet [4]  Carnivore (Invertebrates), Carnivore (Vertebrates), Piscivore
Diet - Ectothermic [4]  30 %
Diet - Fish [4]  30 %
Diet - Invertibrates [4]  40 %
Forages - Ground [4]  20 %
Forages - Water Surface [4]  50 %
Forages - Underwater [4]  30 %
Clutch Size [3]  2
Global Population (2017 est.) [2]  350,000
Maximum Longevity [1]  24 years
Wing Span [5]  3.9 feet (1.2 m)


Name Countries Ecozone Biome Species Report Climate Land
Baja California desert Mexico Nearctic Deserts and Xeric Shrublands
California coastal sage and chaparral Mexico, United States Nearctic Mediterranean Forests, Woodlands, and Scrub
California interior chaparral and woodlands United States Nearctic Mediterranean Forests, Woodlands, and Scrub
California montane chaparral and woodlands United States Nearctic Mediterranean Forests, Woodlands, and Scrub
Gulf of California xeric scrub Mexico Nearctic Deserts and Xeric Shrublands
San Lucan xeric scrub Mexico Neotropic Deserts and Xeric Shrublands
Sierra de la Laguna dry forests Mexico Neotropic Tropical and Subtropical Dry Broadleaf Forests
Sonoran desert Mexico, United States Nearctic Deserts and Xeric Shrublands

Protected Areas

Name IUCN Category Area acres Location Species Website Climate Land Use
Alto Golfo de California y Delta del Rio Colorado Biosphere Reserve VI 2320468 Sonora, Mexico  
Cabrillo National Monument V 149 California, United States
California Coast Ranges Biosphere Reserve 153447 California, United States  
Channel Islands National Marine Sanctuary   California, United States
Channel Islands National Park II 139010 California, United States
Elkhorn Slough Preserve Nature Conservancy - Preserve Ia 964 California, United States  
Farallon National Wildlife Refuge IV 352 California, United States
Golden Gate National Recreation Area V 26135 California, United States
Lake Mead National Recreation Area V 670229 Arizona, Nevada, United States
Lanphere-Christensen Dunes Preserve Nature Conservancy - Preserve Ia 471 California, United States  
Nipomo Dunes Preserve Nature Conservancy - Preserve Ia 3725 California, United States
Olympic Biosphere Reserve II 922805 Washington, United States
Organ Pipe Cactus Biosphere Reserve 327376 Arizona, United States  
Pacific Rim National Park Reserve II 137900 British Columbia, Canada
Point Reyes National Seashore II 27068 California, United States
Redwood National Park II 77867 California, United States
Reserva de la Biosfera El Vizcaino Biosphere Reserve VI 6176727 Mexico  
San Juan Island National Historical Park III 1674 Washington, United States
Santa Cruz Island Preserve Nature Conservancy - Preserve 46021 California, United States
Santa Monica Mountains National Recreation Area V 38440 California, United States


Important Bird Areas

BirdLife Species Factsheet: View Factsheet
Name Location  IBA Criteria   Website   Climate   Land Use 
Channel Islands (Northern) USA A1, A4i, A4ii  
San Diego Bay USA A1, A4i
Santa Clara River Valley USA A1

Biodiversity Hotspots

Name Location Endemic Species Website
California Floristic Province Mexico, United States No
Mesoamerica Belize, Costa Rica, El Salvador, Guatemala, Honduras, Mexico, Nicaragua, Panama No

Prey / Diet

Citharichthys sordidus (Sanddab)[6]
Clupea harengus (Yawling)[7]
Clupea pallasii (Pacific herring)[7]
Doryteuthis opalescens (california market squid)[8]
Engraulis anchoita (Anchoita)[7]
Engraulis australis (Australian anchovy)[7]
Engraulis capensis (Southern African anchovy)[7]
Engraulis encrasicolus (Southern African anchovy)[7]
Engraulis japonicus (Japanese anchovy)[7]
Engraulis mordax (Californian anchoveta)[7]
Kondakovia longimana (Giant Warty Squid)[7]
Pleuroncodes planipes (pelagic red crab)[7]
Porichthys notatus (Midshipman)[6]
Sardina pilchardus (European pilchard)[7]
Sardinops sagax (Australian pilchard)[7]
Sprattus sprattus (Whitebait)[7]

Prey / Diet Overlap

Competing SpeciesCommon Prey Count
Alopias vulpinus (Zorro thresher shark)1
Anoplopoma fimbria (Skil)1
Arctocephalus townsendi (Guadalupe Fur Seal)1
Brachyramphus marmoratus (Marbled Murrelet)1
Callorhinus ursinus (Northern Fur Seal)1
Caulolatilus princeps (Bighead tilefish)1
Cerorhinca monocerata (Rhinoceros Auklet)1
Citharichthys sordidus (Sanddab)1
Delphinus delphis (Short-beaked Saddleback Dolphin)1
Enhydra lutris (Sea Otter)1
Eopsetta jordani (Petrale sole)1
Gavia arctica (Black-throated Loon)1
Genyonemus lineatus (White croaker)1
Hippoglossus stenolepis (Pacific halibut)1
Kogia breviceps (Pygmy Sperm Whale)1
Larus californicus (California Gull)1
Larus canus (Mew Gull)1
Larus glaucescens (Glaucous-winged Gull)1
Lissodelphis borealis (Northern Right Whale Dolphin)1
Merluccius productus (Whiting)1
Mirounga angustirostris (Northern Elephant Seal)1
Ophiodon elongatus (Lingcod)1
Phalacrocorax penicillatus (Brandt's Cormorant)1
Phoca vitulina (Harbor Seal)1
Phocoena phocoena (Harbor Porpoise)1
Phocoenoides dalli (Dall's Porpoise)1
Prionace glauca (Tribon blou)1
Puffinus creatopus (Pink-footed Shearwater)1
Puffinus griseus (Sooty Shearwater)1
Puffinus tenuirostris (Short-tailed Shearwater)1
Raja rhina (Longnose skate)1
Sebastes flavidus (Yellowtail rockfish)1
Sebastes goodei (Rockfish)1
Tursiops truncatus (Bottlenosed Dolphin)1
Uria aalge (Common Murre)1
Zalophus californianus (California Sealion)1


Larus livens (Yellow-footed Gull)[5]

Institutions (Zoos, etc.)

Institution Infraspecies / Breed 
Oceanario de Lisboa
Project Wildlife

Range Map

North America;



Attributes / relations provided by
1de Magalhaes, J. P., and Costa, J. (2009) A database of vertebrate longevity records and their relation to other life-history traits. Journal of Evolutionary Biology 22(8):1770-1774
2Partners in Flight Avian Conservation Assessment Database, version 2017. Accessed on January 2018.
3Terje Lislevand, Jordi Figuerola, and Tamás Székely. 2007. Avian body sizes in relation to fecundity, mating system, display behavior, and resource sharing. Ecology 88:1605
4Hamish Wilman, Jonathan Belmaker, Jennifer Simpson, Carolina de la Rosa, Marcelo M. Rivadeneira, and Walter Jetz. 2014. EltonTraits 1.0: Species-level foraging attributes of the world's birds and mammals. Ecology 95:2027
5del Hoyo, J., Elliott, A., Sargatal, J., Christie, D.A. & de Juana, E. (eds.). Handbook of the Birds of the World Alive. Lynx Edicions, Barcelona.
6Szoboszlai AI, Thayer JA, Wood SA, Sydeman WJ, Koehn LE (2015) Forage species in predator diets: synthesis of data from the California Current. Ecological Informatics 29(1): 45-56. Szoboszlai AI, Thayer JA, Wood SA, Sydeman WJ, Koehn LE (2015) Data from: Forage species in predator diets: synthesis of data from the California Current. Dryad Digital Repository.
7Jorrit H. Poelen, James D. Simons and Chris J. Mungall. (2014). Global Biotic Interactions: An open infrastructure to share and analyze species-interaction datasets. Ecological Informatics.
8CephBase - Cephalopod (Octopus, Squid, Cuttlefish and Nautilus) Database
Ecoregions provided by World Wide Fund For Nature (WWF). WildFinder: Online database of species distributions, ver. 01.06 WWF WildFINDER
Biodiversity Hotspots provided by Critical Ecosystem Partnership Fund
Images provided by Google Image Search
Abstract provided by DBpedia licensed under a Creative Commons License
Weather provided by NOAA METAR Data Access