Animalia > Chordata > Aves > Passeriformes > Icteridae > Quiscalus > Quiscalus major

Quiscalus major (Boat-tailed Grackle)

Synonyms: Cassidix major

Wikipedia Abstract

The boat-tailed grackle (Quiscalus major) is a passerine bird of the family Icteridae found as a permanent resident on the coasts of the southeastern United States. It is found in coastal saltwater marshes, and, in Florida, also on inland waters. The nest is a well-concealed cup in trees or shrubs near water; three to five eggs are laid. These birds forage on the ground, in shallow water, or in shrubs; they will steal food from other birds. They are omnivorous, eating insects, minnows, frogs, eggs, berries, seeds, and grain, even small birds.
View Wikipedia Record: Quiscalus major


EDGE Analysis

Uniqueness Scale: Similiar (0) 
 Unique (100)
Uniqueness & Vulnerability Scale: Similiar & Secure (0) 
 Unique & Vulnerable (100)
ED Score: 2.22611
EDGE Score: 1.17128


Adult Weight [1]  158 grams
Birth Weight [3]  7 grams
Female Weight [1]  111 grams
Male Weight [1]  206 grams
Weight Dimorphism [1]  85.6 %
Breeding Habitat [2]  Coastal saltmarshes, Freshwater marshes
Wintering Geography [2]  Non-migrartory
Wintering Habitat [2]  Coastal saltmarshes, Freshwater marshes
Diet [4]  Carnivore (Invertebrates), Carnivore (Vertebrates), Piscivore, Granivore
Diet - Endothermic [4]  10 %
Diet - Fish [4]  10 %
Diet - Invertibrates [4]  40 %
Diet - Scavenger [4]  10 %
Diet - Seeds [4]  30 %
Forages - Mid-High [4]  10 %
Forages - Understory [4]  20 %
Forages - Ground [4]  70 %
Clutch Size [5]  4
Clutches / Year [3]  1
Global Population (2017 est.) [2]  1,900,000
Incubation [3]  13 days
Maximum Longevity [3]  13 years


Name Countries Ecozone Biome Species Report Climate Land
Atlantic coastal pine barrens United States Nearctic Temperate Coniferous Forests  
Everglades United States Neotropic Flooded Grasslands and Savannas
Florida sand pine scrub United States Nearctic Temperate Coniferous Forests
Middle Atlantic coastal forests United States Nearctic Temperate Coniferous Forests
Mississippi lowland forests United States Nearctic Temperate Broadleaf and Mixed Forests
Northeastern coastal forests United States Nearctic Temperate Broadleaf and Mixed Forests
South Florida rocklands United States Neotropic Tropical and Subtropical Moist Broadleaf Forests
Southeastern conifer forests United States Nearctic Temperate Coniferous Forests
Southeastern mixed forests United States Nearctic Temperate Broadleaf and Mixed Forests
Western Gulf Coastal grasslands Mexico, United States Nearctic Tropical and Subtropical Grasslands, Savannas, and Shrublands  

Protected Areas

Name IUCN Category Area acres Location Species Website Climate Land Use
Arches National Park II 76539 Utah, United States
Assateague Island National Seashore II 8621 Maryland, United States
Big Cypress National Preserve V 732120 Florida, United States
Biscayne National Park II 11085 Florida, United States
Blackbeard Island National Wildlife Refuge IV 4842 Georgia, United States
Blackwater National Wildlife Refuge VI 19192 Maryland, United States
Bombay Hook National Wildlife Refuge VI 16363 Delaware, United States
Canaveral National Seashore II 9090 Florida, United States
Cape Hatteras National Seashore II 21476 North Carolina, United States
Cape Lookout National Seashore II 18379 North Carolina, United States
Cape Romain National Wildlife Refuge IV 8964 South Carolina, United States
Carolinian-South Atlantic Biosphere Reserve 310228 North Carolina, South Carolina, Georgia, United States      
Central Gulf Coastal Plain Biosphere Reserve 40530 United States  
Cumberland Island National Seashore II 20629 Georgia, United States
Fort Caroline National Memorial III 137 Florida, United States
Fort Matanzas National Monument III 269 Florida, United States
Fort Pulaski National Monument V 4213 Georgia, United States
Gateway National Recreation Area V 1807 New Jersey, United States
Jean Lafitte National Hist. Park & Preserve National Historical Park II 17686 Louisiana, United States
Lacassine National Wildlife Refuge VI 28351 Louisiana, United States
Little St. Simons Island   Georgia, United States
Okefenokee National Wildlife Refuge IV 38256 Florida, United States
Reserva de la Biosfera El Cielo Biosphere Reserve 353161 Mexico  
Santee Coastal Reserve and Washo Reserve State Habitat Area IV 20850 South Carolina, United States  
South Atlantic Coastal Plain Biosphere Reserve 20317 South Carolina, United States  
Virginia Coast Biosphere Reserve 33386 Virginia, United States  

Prey / Diet

Brasenia schreberi (schreber watershield)[6]
Gallinula chloropus (Common Moorhen)[6]
Gambusia affinis (Live-bearing tooth-carp)[6]
Hermetia illucens (black soldier fly)[6]
Hydrocotyle incrassata[6]
Lemna minor (common duckweed)[6]
Morella cerifera (wax myrtle)[6]
Sorghum bicolor (broom-corn)[6]
Zea mays (corn)[6]


Parasitized by 
Brachylecithum americanum <Unverified Name>[7]
Dicranotaenia farcimosa <Unverified Name>[7]
Diplotriaena tricuspis <Unverified Name>[7]
Dispharynx nasuta <Unverified Name>[7]
Echinostoma trivolvis <Unverified Name>[7]
Filaria obtunsa <Unverified Name>[7]
Viktorocara garridoi <Unverified Name>[7]

Range Map

North America;



Attributes / relations provided by
1Post, W., JP Poston and GT Bancroft. 1996. Boat-tailed Grackle (Quiscalus major). In The Birds of North America, No. 207 (A. Poole and F. Gill, Eds.).The Academy of Natural Sciences: Philadel- phia; and The American Ornithologists' Union: Washington, DC
2Partners in Flight Avian Conservation Assessment Database, version 2017. Accessed on January 2018.
3de 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
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
5Jetz W, Sekercioglu CH, Böhning-Gaese K (2008) The Worldwide Variation in Avian Clutch Size across Species and Space PLoS Biol 6(12): e303. doi:10.1371/journal.pbio.0060303
6Jorrit 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.
7Gibson, D. I., Bray, R. A., & Harris, E. A. (Compilers) (2005). Host-Parasite Database of the Natural History Museum, London
Ecoregions provided by World Wide Fund For Nature (WWF). WildFinder: Online database of species distributions, ver. 01.06 WWF WildFINDER
Images provided by Wikimedia Commons licensed under a Creative Commons License
Abstract provided by DBpedia licensed under a Creative Commons License
Weather provided by NOAA METAR Data Access