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In the familiar North American comparison, the Common Raven is larger, heavier-billed, and rougher-voiced than the American Crow. In flight, a raven’s tail tapers to a diamond or wedge, while a crow’s looks more rounded. Voice is often the most reliable clue; combine it with size, shape, and other visible features when you can.
Which birds does this comparison cover?
The clearest side-by-side comparison is between the American Crow and the Common Raven in North America. Both belong to the genus Corvus, but “crow” and “raven” are common names, not two globally consistent taxonomic groups. The general shortcut that ravens are bigger describes a tendency, not a rule for every species or region. Cornell Lab of Ornithology’s crow FAQ discusses this naming distinction.
How to tell an American Crow from a Common Raven
| Clue | American Crow | Common Raven |
|---|---|---|
| Typical length | 20 inches, as listed in Cornell Lab Bird Academy’s comparison | 27 inches, as listed in Cornell Lab Bird Academy’s comparison |
| Tail in flight | Appears slightly rounded | Longer and tapered, often diamond- or wedge-shaped |
| Bill and throat | More modestly proportioned bill and throat | Larger, heavier bill and conspicuous shaggy throat feathers |
| Call | Familiar caw | Lower, rougher call |
The length figures are typical comparison-page measurements, not a guarantee that size alone identifies an individual bird. They are most useful when you can compare the bird with a familiar object or another bird; judging the size of a lone bird at a distance is difficult. Source: Cornell Lab Bird Academy, “American Crows and Common Ravens”.
Which field mark is most useful?
Listen when you can
Voice is often the strongest clue. A crow’s recognizable caw contrasts with the raven’s lower, rougher call. Cornell Lab’s crow FAQ cautions that, without extensive close-observation experience, identification is safest by voice: Frequently Asked Questions About Crows. If the bird is silent, do not treat a quick visual impression as certain.
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When the tail is visible in flight, its outline can help: a crow’s is slightly rounded, while a raven’s longer tail narrows toward a diamond or wedge. Tail shape is less useful if the bird is perched, distant, or seen at an angle that hides the outline. Cornell’s Common Raven identification guide describes the raven’s field marks.
Use size, bill, and throat together
A raven generally looks bulkier, with a heavier bill and shaggy throat feathers; a crow looks smaller and more modestly proportioned. Compare these features rather than relying on just one, especially when there is no nearby object to judge scale.
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What if you still cannot tell?
- Note whether the bird calls; the difference in voice may be more informative than a distant view.
- Wait for a flight view if possible, when the tail outline is visible.
- Compare overall bulk, bill, and throat plumage together rather than treating any one mark as decisive.
- If the bird is far away, silent, or only briefly visible, record the identification as uncertain. The common-name distinction does not provide a single field mark that separates every crow and raven species worldwide.
For a North American American Crow/Common Raven comparison, Cornell’s overview of visual and sound cues is available in its October 22, 2024 article, “How to Tell Crows and Ravens Apart by Sight and Sound”.
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