Chordata · chordates

Double-crested cormorant

Nannopterum auritum

Phalacrocoracidae · cormorantsIUCN: Least Concern
Double-crested cormorant
Photo: Mdf · CC BY-SA 3.0 · Wikimedia Commons · resized

A dark diving bird often seen drying its spread wings on pilings.

Fun factIts feathers soak up some water, which helps it dive but means it must dry off afterward.

Waters
Northeast US, Northwest Atlantic, Eastern Pacific
Depth zone
Coastal shallows & estuaries
Diet
Fish
Size
Wingspan up to 1.2 m

Classification

Chordata › Reptilia › Suliformes › Phalacrocoracidae

  1. Kingdom Animalia animals
    • Many-celled organisms that eat other living things for energy (heterotrophs)
    • Cells have no cell walls
    • Most can move at some stage of life
  2. Clade Bilateria bilateral animals
    • Body has a left and right side that mirror each other (bilateral symmetry)
    • Head end with concentrated nerves; three tissue layers
    • Includes about 99% of all living animal species
  3. Clade Deuterostomia deuterostomes
    • In the embryo, the first opening becomes the anus and the mouth forms second
    • Includes echinoderms and chordates
  4. Phylum Chordata chordates
    • At some stage of life: a stiffening rod along the back (notochord)
    • A hollow nerve cord along the back (dorsal)
    • Slits in the throat (pharyngeal slits) and a tail past the anus
  5. Subphylum Vertebrata vertebrates
    • A skull (cranium) protecting a brain
    • Backbone or similar support around the nerve cord
    • Includes fishes, amphibians, reptiles, birds, and mammals
  6. Infraphylum Gnathostomata jawed vertebrates
    • Jawed vertebrates: jaws formed from gill arches
    • Paired fins or limbs
    • Includes all fishes except hagfish and lampreys, plus all tetrapods
  7. Superclass Osteichthyes bony vertebrates
    • Bony vertebrates: skeleton made largely of bone
    • Most have a lung or swim bladder
    • Includes ray-finned and lobe-finned fishes and all tetrapods
  8. Clade Sarcopterygii lobe-finned vertebrates
    • Lobe-finned: fleshy fins with bones like those of limbs
    • Includes coelacanths, lungfishes, and all tetrapods
  9. Clade Tetrapoda four-limbed vertebrates
    • Four limbs with fingers and toes (or descended from animals that had them)
    • Breathe air with lungs
  10. Class Reptilia reptiles (birds included)
    • Scaly skin made of keratin
    • Lay shelled eggs on land or carry eggs inside the body (amniotic egg)
    • In modern classification this group includes birds
  11. Clade Archosauria crocodilians & birds
    • Includes crocodilians, birds, and extinct dinosaurs and pterosaurs
    • Birds and crocodilians share a four-chambered heart and a muscular gizzard
  12. Class Aves birds
    • Birds: feathers
    • Toothless beak
    • Lay hard-shelled eggs; warm-blooded
  13. Clade Aequornithes core waterbirds
    • Core waterbirds: penguins, tubenoses, gannets, pelicans, herons, and loons
  14. Order Suliformes gannets, boobies & frigatebirds
    • Gannets, boobies, cormorants, and frigatebirds
    • All four toes joined by webbing (totipalmate feet)
  15. Family Phalacrocoracidae cormorants
    • Cormorants: dark diving birds with hooked bills
    • Spread their wings to dry after diving
  16. Genus Nannopterum
    • Species in the same genus are very close relatives and often look alike.
  17. Species Nannopterum auritum Double-crested cormorant

Closest relatives in the guide