Crow

About

Crows are highly intelligent, medium-sized to large passerine birds in the genus Corvus. They are known for their glossy black plumage, distinctive calls, and complex social structures. Crows are highly adaptable and found in a wide variety of habitats across the globe, excluding Antarctica and some oceanic islands. They are omnivorous and play a significant ecological role as scavengers and predators.

Size & lifespan

Length

40-53 cm (16-21 in)

Wingspan

85-100 cm (33-39 in)

Weight

300-600 g (10.6-21.2 oz)

Lifespan

7-8 years in the wild, up to 20 years in captivity

Diet

Omnivore

Physical characteristics

Plumage

Entirely glossy black plumage, often with iridescent purple, blue, or green sheens visible in good light. The feathers are dense and stiff.

Beak shape

Strong, heavy, and slightly decurved black beak. The culmen (upper ridge) is typically straight or slightly arched.

Eye color

Dark brown to black

Leg color

Black

Distinguishing features

Overall large size, entirely black plumage, robust build, and distinctive 'caw' calls. The tail is typically fan-shaped or slightly rounded at the tip when spread in flight.

Juvenile appearance

Juveniles resemble adults but have duller, less glossy black plumage, often with a brownish tinge. Their eyes may appear lighter, and the gape (corner of the mouth) can be yellowish for a period after fledging.

Seasonal changes

No significant seasonal plumage changes. Plumage remains consistently black year-round.

Sexual dimorphism

Minimal to no sexual dimorphism in plumage or size; males and females look alike.

How to identify

1. 1

   Size and Shape

   Look for a medium-large, all-black bird with a sturdy build and a relatively large head. The tail is typically fan-shaped or slightly rounded at the tip.

2. 2

   Plumage

   Observe the plumage for its uniform glossy black color, which can show iridescent purples or blues in direct sunlight. There are no other colors or markings.

3. 3

   Beak

   Note the strong, heavy, and entirely black beak. It is not as massive as a raven's, nor as slender as a jackdaw's.

4. 4

   Vocalizations

   Listen for the characteristic loud, harsh 'caw-caw-caw'. Pay attention to variations in pitch and rhythm, as this is often the most reliable way to distinguish crow species from each other and from ravens.

5. 5

   Flight Pattern

   Observe their direct, steady flight with regular wingbeats. While they can soar, they typically flap more continuously than ravens. The tail shape in flight is a key differentiator from ravens.

6. 6

   Behavior

   Look for social behavior, such as foraging in groups, mobbing predators, or forming large communal roosts. Their intelligence is often evident in their problem-solving and tool-using behaviors.

Habitat & range

Biomes

Forests, woodlands, agricultural lands, urban and suburban areas, open country with scattered trees, coastal areas.

Geographic range

Widespread across most continents, including North America, Europe, Asia, and parts of Africa and Australia. Specific species have more restricted ranges (e.g., American Crow in North America, Carrion Crow in Europe/Asia).

Elevation range

Sea level up to high elevations in mountainous regions, depending on the species and local conditions.

Preferred environments

Highly adaptable, preferring areas with a mix of open ground for foraging and tall trees for nesting and roosting. They thrive in human-modified landscapes.

Behavior

Activity time

Diurnal

Feeding habits

Highly opportunistic omnivores. Diet includes insects, worms, grubs, seeds, fruits, nuts, carrion, eggs and nestlings of other birds, small mammals, and human refuse. They often cache food.

Social behavior

Highly social birds, often forming large communal roosts, especially outside the breeding season. They exhibit complex social structures, cooperative breeding, and mobbing behavior against predators.

Flight pattern

Strong, direct, and purposeful flight with steady wingbeats. They can also soar and glide, especially at higher altitudes. Often seen in undulating flight when commuting.

Migration pattern

Most crow species are resident year-round. Some northern populations may undertake short-distance migratory movements to warmer areas during harsh winters, but long-distance migration is uncommon for the genus as a whole.

Territoriality

Breeding pairs are territorial, defending their nest site and immediate foraging area. Outside the breeding season, they are less territorial and often forage in groups.

Breeding & reproduction

Breeding season

Typically spring to early summer, varying geographically (e.g., March-July in North America).

Nesting habits

Monogamous pairs build large, bulky stick nests high in trees, often near the trunk or in a major fork. Nests are lined with softer materials like mud, grass, hair, and bark strips. Both sexes participate in nest building.

Clutch size

3-7 eggs, commonly 4-6.

Egg description

3-7 eggs, typically pale blue-green or olive-green, heavily marked with brown, olive, or gray spots and blotches, especially at the larger end. Eggs are oval-shaped.

Incubation period

18-20 days, primarily by the female.

Fledging period

30-35 days after hatching. Young remain dependent on parents for several weeks to months after fledging.

Parental care

Both parents feed and care for the young. Often, offspring from previous years (helpers) may assist in raising the current brood, demonstrating cooperative breeding.

Where to find

Field tips

1. Listen for Calls. Crows are often heard before they are seen. Learn to recognize their distinctive 'caw' calls, which can lead you to their location.
2. Look for Roosts. In late afternoon and evening, observe the sky for large numbers of crows flying towards communal roosting sites, which can be large stands of trees.
3. Observe Foraging Behavior. Watch for crows walking on the ground in open areas, probing with their bills, or scavenging. They are often seen near roadsides or dumpsters.
4. Check for Mobbing. Crows frequently mob larger birds of prey (hawks, owls) or other perceived threats. Following the commotion can lead you to a crow sighting.

Similar species

Quick facts

Intelligence:

Among the most intelligent birds, capable of problem-solving, tool use, and facial recognition.

Social Structure:

Complex social groups, often with cooperative breeding and large communal roosts.

Dietary Flexibility:

Highly adaptable omnivores, consuming a vast array of food items.

Vocal Repertoire:

Possess a wide range of vocalizations beyond the typical 'caw'.

Ecological Role:

Important scavengers, helping to clean up carrion and waste.

Fun facts

• Crows have been observed using tools, such as bending wire to retrieve food or dropping nuts onto roads for cars to crack them.
• They can recognize individual human faces and remember them for years, even passing this information to other crows.
• Crows hold 'funerals' for their dead, gathering around a deceased crow, which scientists believe is a way to learn about potential threats.
• Some crow species engage in 'anting,' where they allow ants to crawl on their feathers, possibly to remove parasites or for the formic acid's soothing properties.
• Crows are known to mimic sounds, including human speech, although less frequently than parrots.

Scientific classification

Kingdom

Animalia

Phylum

Chordata

Class

Aves

Order

Passeriformes

Family

Corvidae

Genus

Corvus

Species

Multiple species within the genus Corvus (e.g., Corvus brachyrhynchos - American Crow, Corvus corone - Carrion Crow)

Explore the Crow