Anhinga vs Cormorant for Kids
Anhingas and cormorants are close relatives in the waterbird order Suliformes, but they are not the same bird. This page compares the anhinga, Anhinga anhinga, with the double-crested cormorant, Nannopterum auritum. Both dive with webbed feet, eat fish, float low, nest near water, and often hold damp wings open. The anhinga is longer and slimmer, with a fan tail, serpentlike neck, and straight dagger bill for stealthy close-range strikes. The cormorant is generally heavier, with a shorter tail, hooked bill, stronger pursuit-diving build, and larger colonies. A 2025 physiological study of these exact Florida species found different swimming strategies rather than one simple better diver.
Anhinga
- Type: Slender Freshwater Darter or Snakebird
- Group: Living species Anhinga anhinga, a darter in order Suliformes and family Anhingidae; it is a close cormorant relative but not a cormorant
- Known for: Very long S-shaped neck, straight daggerlike bill, long fan-shaped tail, silvery wing markings, low-floating snakebird silhouette, stealthy underwater stalking, fish stabbing, soaring, and spread-wing drying
- Diet: Carnivore eating mainly small fishes plus aquatic crustaceans and other small water animals, usually captured during slow submerged stalking and brought to the surface to swallow
- Special skill: Reducing buoyancy with wettable plumage and dense bones, swimming almost hidden with only the long head and neck above water, then striking a small fish with a rapid dagger-bill thrust
Double-Crested Cormorant
- Type: Stocky Pursuit-Diving Cormorant
- Group: Living species Nannopterum auritum, a cormorant in order Suliformes and family Phalacrocoracidae; older references commonly place it in genus Phalacrocorax
- Known for: Heavy dark body, kinked neck, strongly hooked bill, orange-yellow facial skin, aquamarine eyes, tiny seasonal double crest, webbed feet, active pursuit diving, low floating, V-shaped travel flocks, colonies, and spread-wing drying
- Diet: Carnivore eating mostly fishes, pursued actively underwater and grasped with a hooked bill, plus occasional crustaceans, amphibians, or other aquatic prey available locally
- Special skill: Powering energetic underwater pursuit with large webbed feet and an unusually large, oxygen-supported gastrocnemius swimming muscle while the hooked bill grips slippery fish
Quick Answer
Quick answer: An anhinga is a slender freshwater darter with a very long neck, long tail, and straight pointed bill. It often stalks slowly underwater and stabs small fish. A double-crested cormorant is stockier and can be much heavier, with a shorter tail and strongly hooked bill. It actively pursues and grips fish underwater. Both have wettable plumage, webbed feet, low buoyancy, colonial nests, and the familiar spread-wing drying pose.
Anhinga vs Double-Crested Cormorant: Quick Comparison
| Feature | Anhinga | Double-Crested Cormorant |
|---|---|---|
| Scientific identity | Anhinga anhinga; family Anhingidae | Nannopterum auritum; family Phalacrocoracidae |
| Published adult measurements | 75-95 cm long; about 1.33 kg; wingspan near 109 cm | 70-90 cm long; about 1.2-2.5 kg; wingspan 114-123 cm |
| Overall shape | Very slender body, extremely long neck, and long fan-shaped tail | Stocky heavy body, kinked neck, and shorter rounded tail |
| Bill | Long, straight, narrow, and daggerlike for striking fish | Long but thicker, with a strong hook at the tip for grasping fish |
| Underwater hunting | Slow, often passive lie-in-wait stalking in shallow vegetation | Energetic pursuit swimming in fresh or salt water |
| Swimming power | Webbed feet and a smaller leg-muscle oxygen reservoir support short stealthy dives | Webbed feet and a larger, more oxidative swimming muscle support active pursuit |
| At the surface | Can sink until only the snakelike head and neck remain visible | Usually floats low with more of the back visible and bill tilted upward |
| Typical habitat | Mostly sheltered shallow freshwater with trees and vegetation | Lakes, rivers, reservoirs, estuaries, bays, and sheltered coasts |
| Social life | Often solitary while feeding; loose or mixed nesting colonies | Flocks, group fishing at times, and often large dense nesting colonies |
| Young | Usually several naked chicks in a stick nest; both parents care | Usually several naked chicks; both parents feed, shade, and may bring water |
How Are Anhinga and Double-Crested Cormorant Alike?
- Both are living suliform waterbirds related to boobies, frigatebirds, and other fish-catching coastal or inland birds.
- Both have all four toes joined by webbing, use their feet as the main underwater propellers, and steer with the tail and body.
- Both have wettable rather than fully waterproof outer plumage, sit low in water, and frequently spread their wings after diving.
- Both eat mainly fish, swallow prey headfirst near the surface, soar or fly between feeding and roosting sites, and need air even while diving.
- Both build stick nests near water, may join mixed waterbird colonies, lay pale eggs, and share incubation and chick feeding between parents.
How Are Anhinga and Double-Crested Cormorant Different?
- The anhinga belongs to darter family Anhingidae, while the double-crested cormorant belongs to cormorant family Phalacrocoracidae.
- Anhingas have a straighter dagger bill, a much longer fan tail, and a slimmer snakebird outline; cormorants have a hooked bill, heavier body, and shorter tail.
- The anhinga often waits or stalks slowly in shallow cover before a sudden strike, while the cormorant actively chases fish through open water.
- Anhingas are tied mostly to warm sheltered freshwater feeding areas, while double-crested cormorants use both inland fresh water and many coastal habitats.
- Cormorants usually gather in larger feeding, travelling, roosting, and breeding groups; anhingas may nest colonially but often forage alone and quietly.
Anhinga vs Cormorant Showdown
Adaptation showdown: Double-Crested Cormorant wins size because its published mass range reaches about 2.5 kilograms and its wingspan reaches 123 centimetres, although the slimmer Anhinga can be slightly longer from bill to tail. Speed is a Tie because there is no reliable same-condition race in air or water and each changes pace with hunting, takeoff, currents, and depth. Double-Crested Cormorant wins strength for absolute prey handling because it can be much heavier, actively wrestles through pursuit dives, and grips fish with a robust hooked bill; this is not a fight prediction. Anhinga wins stealth because research describes its uncommon passive, lie-in-wait method and its ability to sink until only a thin snakelike neck shows. Double-Crested Cormorant wins social behaviour for larger travel flocks, coordinated feeding at times, dense colonies, and chick creches. Double-Crested Cormorant wins swimming because the exact-species physiological study found proportionally larger leg muscles, about five times more total available myoglobin in that muscle, and higher oxidative capacity supporting sustained active pursuit. Anhinga wins weirdest for combining water-wet feathers, dense bones, near-hidden swimming, a folding S-neck, and a dagger bill that can strike fish before tossing them into position for swallowing.
Fun Anhinga vs Cormorant Facts
Their Bills Work Like Different Tools
An anhinga closes in slowly, springs its flexible neck, and drives a straight pointed bill at a small fish. A double-crested cormorant chases prey and closes a thicker bill whose hooked tip helps hold a slippery catch. Neither bill is a set of teeth, and neither bird chews its meal.
Wet Feathers Help Them Sink
Their feathers are not completely waterproof. Water entering the outer plumage reduces trapped air and buoyancy, helping the birds submerge without fighting a powerful upward force. The trade-off is heat loss and extra drying time, so both often rest with wings spread after a dive.
One Study Found Two Diving Engines
Researchers studying ten anhingas and ten double-crested cormorants found that cormorants had proportionally larger gastrocnemius swimming muscles and more available muscle myoglobin. Anhingas used a lower-energy stalking style, while cormorants had a more oxidative system for active underwater pursuit.
The Snakebird Disappears in Plain Sight
Wettable feathers, dense bones, a narrow body, and careful breath control let an anhinga ride extremely low. In calm water, the body can vanish below the surface while the head and neck move above it like a swimming snake. This is camouflage and buoyancy control, not proof that the bird is part snake.
Cormorant Chicks May Join a Creche
Double-crested cormorants nest close together. On ground colonies, growing chicks sometimes leave their own nests and gather with other youngsters in a creche, yet return to their parents for food. Adults also shade hot chicks and can carry water in the mouth to pour into a chick’s mouth.
Anhinga vs Cormorant Quiz
- Which bird has the straight daggerlike bill? Answer: The anhinga.
- Which benchmark can weigh about 2.5 kilograms? Answer: The double-crested cormorant.
- Why do both birds spread their wings after diving? Answer: Their wettable feathers need drying, and the pose can also help with warming.
- Which bird is the more active underwater pursuit hunter? Answer: The double-crested cormorant.
- Is an anhinga a kind of cormorant? Answer: No. It is a close relative in the separate darter family Anhingidae.
Anhinga vs Cormorant FAQ
What is the main difference between an anhinga and cormorant?
An anhinga is slimmer with a very long tail, serpentlike neck, and straight fish-striking bill; a double-crested cormorant is stockier with a hooked fish-gripping bill and more active pursuit dives.
Which is bigger, anhinga or cormorant?
The cormorant wins by mass and wingspan, reaching about 2.5 kilograms and 123 centimetres across, although anhingas can be slightly longer from bill to tail.
Can anhingas and cormorants swim underwater?
Yes. Both are foot-propelled divers, but anhingas often stalk slowly in shallow cover while cormorants pursue fish more energetically.
Why do they hold their wings open?
Their outer plumage becomes wet during dives, so wing spreading helps expose feathers to moving air and can help the bird regain heat.
How can I tell them apart from far away?
Look for the anhinga’s needle-straight bill, extremely long thin neck, long fan tail, and silvery wing pattern versus the cormorant’s heavier body, shorter tail, hooked bill, and orange-yellow facial skin.
Animal Words to Know
- Darter: A member of family Anhingidae, named for the rapid neck-and-bill action used when catching fish.
- Buoyancy: The upward force from water that makes an object or animal float.
- Myoglobin: An oxygen-binding protein inside muscle that can support activity during a breath-hold dive.
- Pursuit diving: Actively chasing prey underwater rather than waiting or approaching very slowly.
- Creche: A temporary group of young birds that gather together while their parents still provide food.
Build an Anhinga and Cormorant Dive Lab
Build an Anhinga and Cormorant Dive Lab
Draw a split freshwater observation board with an honest shared scale. On the left, show a slender anhinga swimming slowly through reeds with only its narrow head and very long S-shaped neck above water; add a straight dagger bill, long fan tail, silvery wing streaks, fully webbed feet, and a second calm pose drying wings on a branch. On the right, show a stockier double-crested cormorant actively swimming underwater with a heavier body, shorter tail, orange-yellow face, hooked bill, and large webbed feet; add a colony silhouette and a resting wing-drying pose. Include a mass-and-wingspan ruler, bill-tool close-ups, wet-feather bubbles, leg-muscle icons, fish paths, nest and chick cards, and habitat clues without showing capture or injury.
Meet Each Animal
Want the full fact file? Here are quick highlights from each animal’s own facts page.
Anhinga Fact Highlight
From the full animal facts pageDouble-Crested Cormorant Fact Highlight
From the full animal facts pageMore Animal Comparisons
Pick another animal matchup and keep exploring. Tiny facts, big questions, very serious animal business.
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