Category Archives: Vocalizations

Strange Crow Sounds

American crow vocalizing (photo from Wikimedia Commons)

18 November 2025

If you think you can’t recognize birds by song I guarantee there is one whose voice you know. “Caw! Caw! Caw! Caw!” the American crow (Corvus brachyrhynchos).

Crows are especially vocal when they see a predator. If you hear this, look for the owl!

And there’s the Double Short Caw that I often hear in summer. (I have not found a recording of it.)

Caw-Caw.   Caw-Caw.   Caw-Caw.

Double Short Caw. A series of caws delivered in pairs, so that the interval within a pair is smaller than between pairs. Often associated with territorial bouts, Countercawing, directed out of the territory, and particularly with the beginning of chasing bouts. Function as call-to-arms vocalizations for family members.

Birds of the World: American crow vocalizations

Beyond cawing, crows make many strange sounds including rattles, growls, coos and clicks, as seen in this video from @Crows_are_skycats in Seattle.

video embedded from @Crows_are_skycats on YouTube

The Rattle Call is really special. In 2008, R.R. Tarter, found evidence that this sound is only made by the female. Tarter, R. R. (2008). The Vocal Behavior of the American Crow, Corvus brachyrhynchos [master’s thesis]. The Ohio State University

Curious about what crows say? Read about crow vocalizations at Kaeli Swift’s Corvid Research website:

Danger! Hawk!

American robin making a high-pitched alarm call in Prospect Park, NYC (photo from Wikimedia Commons)

10 July 2025

Birdsong is coming to an end as the breeding season wraps up but birds are still making contact and warning calls. In a recent walk in Frick Park Charity Kheshgi pointed out a robin saying “Danger from the air!” a sound so high-pitched that I no longer hear it.

Upper frequency sounds are hard to pinpoint so a robin saying “Danger! Hawk!” should be hard for the hawk to find … except that robins making this warning call usually stand out in the open, as the shown above.

Learn to identify robin and starling warning calls in this vintage article. Unlike birdsong these sounds happen all year long.

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The Nunbird Chorus

White-fronted nunbird (photo from Wikimedia Commons)

27 December 2024

White-fronted nunbirds (Monasa morphoeus) are at their most interesting when they sing in “group choruses of loud gobbling, barking notes, sustained for up to 20 minutes at a time, chiefly at the beginning and end of day.” — quoted from Birds of the World.

video embedded from ravitime nature status on YouTube

If you wanted to hear them in the wild, go to these regions of Central and South America.

Range of white-fronted nunbird (image from Wikimedia Commons)

p.s. “White-fronted” describes birds whose foreheads are white such as the greater white-fronted goose and white-fronted nunbirds.

What Are Crows Saying? Listen to the Gaps

Crow cawing (photo by Bennilover via Flickr Creative Commons license)

5 December 2024

Crows are so vocal that we can’t help but think their caws are a language. So what are crows saying in their big boisterous flocks before they roost?

Dr. Douglas Wacker at University of Washington Bothell (UWB) wondered the same thing so in 2017 his team began recording and analyzing pre-roost aggregations on the UWB roofs. The rooftop recordings were not enough to crack the code so now the team has turned to spectrogram analysis.

Dr. Wacker presented information on crow vocalizations at the Olympic Peninsula Audubon Society in November 2024. To measure the calls they analyzed these components.

  • Syllable = a single caw
  • Gap = the length of silence between caws
  • Call = a series of caws
  • Pause = the length of silence between calls
screenshot from Dr. Douglas Wacker presentation to Olympic Peninsula Audubon, Nov 2024

The team recorded crow vocalizations in various contexts and compared the spectrograms. And they discovered an unusual thing. Crows appear to be “saying” things in the silence between their caws (gaps) and the pauses between their calls.

  • Gaps between caws: Are longer in pre-roost aggregations (evening) than in post-roost aggregations (morning).
  • Pauses between calls: Are shorter while mobbing an owl than in pre-roost aggregations.

If you want to know what a crow is saying, listen to their silences.

Crow cawing (photo by Jennifer Aitkens via Flickr Creative Commons license)

Learn more about crow language in this Olympic Peninsula Audubon Society’s video. I have set it to start nearly an hour into the meeting, beginning with spectrogram analysis of crow calls. I’ve included this 15 minute portion here because it is so interesting. Click here to see the entire 1.5 hour meeting.

video embedded from Olympic Peninsula Audubon Society on YouTube. (Starts at 58 mins into the recording)

Some day we might know what this crow is saying. In the meantime, listen to the gaps.

Crow cawing (photo by Jason Hopkins via Flickr Creative Commons license)

p.s. Dr. Wacker described an intriguing idea: The messages in human language come from our sounds. The messages in crow language appear to come from silences. Perhaps we can’t figure out what crows are saying because we aren’t used to listening to the silences.

Playing Music With Birds

28 April 2024

Now that the breeding season is here the air is filled with birdsong from dawn to dusk. Birds sing to claim territory and attract a mate, but they also appear to sing for the joy of joining others in song. Is the dawn chorus actually a community performance?

In the 1920s British cellist Beatrice Harrison discovered that when she played her cello in the garden the birds responded, approached, and sang along.

Europe’s great songster, the common nightingale, was especially drawn to join her performance. (Click here for the nightingale’s song.)

Common nightingale, singing (photo from Wikimedia Commons)

In 1924 the BBC recorded her playing in the garden with a nightingale joining in.

video embedded from Kall48 on YouTube

Fast forward to modern times. Two decades ago in Chicago, musician Lisa Rest lived in a third floor apartment whose windows were level with the tree canopy. On warm days she played her piano with the window open and eventually noticed that birds approached her window and sang while she was practicing.

Because Lisa has perfect pitch she could tell the birds were singing in key with her music. Soon she became interested in birds, continued playing music with them, and started a blog named Goldbird Variations. The birds were especially drawn when she played Bach’s Goldberg Variations.

Read how her journey began at her blog post below or click here to listen to Aria to the Goldberg by Lisa Rest in which she’s accompanied by house sparrow, house finch, white-throated sparrow and northern cardinal.

Nowadays Lisa Rest often goes birding and blogs about birds and the changing seasons. Catch up with her at Goldbird Variations (https://musicbirdblog.com/).

For more information about Beatrice Harrison and the nightingales see The Cello and Nightingale Sessions at publicradio.org.

(credits are in the captions)

Babble, Ring, Toot and Shout

Arrow-marked babblers (photo from Wikimedia Commons)

26 January 2024: Day 8, Hwange National Park, Zimbabwe — Road Scholar Southern Africa Birding Safari. Click here to see (generally) where I am today.

Though I can identify birds by song at home, it’s almost impossible to do in southern Africa among birds I’ve never heard before. To prepare for this trip I spent time learning about the birds I might see. Then I discovered their odd and distinctive sounds. Here’s a sample of some notable ones.

Babble: Arrow-marked babblers (Turdoides jardineii), pictured above, are gregarious birds that nest cooperatively and love to sing together. One or two birds may start the babbling song, then everyone joins in. Even after the cacaphony stops a few will mutter to each other. Babblers are members of the Laughingthrush family (Leiothrichidae). When I listen to them it makes me laugh.


Ring: The tropical boubou or bellshrike (Laniarius major) is a frequent singer with a bell-like voice. Contact calls like bou, houboubou or bobobobo give the bird its name but in song its vocal repertoire really shines. Boubous often duet in male-female pairs or two males in adjacent territories who call-and-respond so quickly that they sound like one bird. The songs are so amazing that I’ve included three examples.

Tropical boubou pair sing a duet at Hwange (photo from Wikimedia Commons)

Toot: The pearl-spotted owlet (Glaucidium perlatum) is the smallest owl in southern Africa, similar in size to our northern saw-whet owl. Though they aren’t in the same genus, the owlet’s call reminds me of a saw-whet’s toot except for this: The owlet toots louder and higher until he drops off at the end.

Pearl-spotted owlet (photo from Wikimedia Commons)

Shout: The hadada ibis (Bostrychia hagedash) is just plain loud. His name comes from his extremely loud and distinctive “haa-haa-haa-de-dah” call which he makes all year long, especially at dawn and dusk. Hadada ibises are now very common in suburbs where people hear them every day. Imagine one shouting from your roof.

Hadada ibis (photo from Wikimedia Commons)
Hadada ibis drying off on a roof after bathing (photo from Wikimedia Commons)

For more sounds of the African bush, including mammals and frogs, see Derek Solomon’s wildlife sound recordings.

p.s. I heard every one of these birds and I saw all except the pearl-spotted owlet. The owlet called from a hiding place just before sunset.

Go Awaaaay! Go Awaaaaay!

Gray go-away bird (photo from Wikimedia Commons)

23 January 2024: Day 5, Zambezi National Park — Road Scholar Southern Africa Birding Safari. Click here to see (generally) where I am today.

Today we’re on a birding drive through Zambezi National Park where we’re sure to hear the unique call of a very plain bird.

The gray go-away bird (Crinifer concolor) is named for the whiny sound he makes that, in English, sounds like “go awaaaaay.” All gray in color, he has a crest like a northern cardinal but he’s more than twice its length and 10 times its weight. Unlike the cardinal’s beautiful song the go-away bird sounds like he’s whining.

In fact he’s making an alarm call and all the birds and animals know it, fleeing or freezing in place while he warns them.

He whines alone …

… or with a crowd.

Gray go-away birds in a thorn tree (photo from Wikimedia Commons)

Go-away birds don’t fly well but they can clamber.

Though their flight is rather slow and laboured, they can cover long distances. Once in the open tree tops however, they can display the agility which is associated with the Musophagidae [Turacos], as they run along tree limbs and jump from branch to branch. They can form groups and parties numbering even 20 to 30 that move about in search of fruit and insects near the tree tops.

Wikipedia: grey go-away bird

At some point I’m sure they’ll tell us to “Go Awaaaay!”

Cheep and Chip, Tock or Knock

Chipmunk with full cheeks,  Cap Tourmente NWA, Canada (photo from Wikimedia Commons)

1 October 2023

Fall migration has been intense over Pittsburgh lately and promises to be excellent tonight and tomorrow as well. Yesterday morning I went birding at Frick Park, expecting to find loads of warblers. No such luck. The birds flew over without stopping. However, for chipmunks it was a fantastic day.

Despite the current warm weather, chipmunks (Tamias striatus) are frantically gathering food to store in their underground burrows where they’ll spend the winter. Since they can’t use their paws to carry food, they fill their enormous cheek pouches.

What could possibly make their cheeks so fat? How about acorns?

Chipmunk stuffing an acorn in his cheek (photo from Wikimedia Commons)

With so many chipmunks scurrying in autumn, you rarely see two together. Chipmunks are antisocial but they like to make calls to warn each other of predators. Among their most common calls are two kinds of warnings.

Cheep or Chip: “Danger from the ground!” This call sounds almost like a bird and warns of nearby terrestrial predators such as a cat, fox, coyote or raccoon.

video embedded from @MarkCz on YouTube

Tock or Knock: “Danger from the air! I see a hawk!” This is a useful call for birders that tells us to search for a hawk nearby. However, chipmunks know that hawks fly rapidly through the forest so all of them take up the call, far and wide, even though the hawk is not near them. Tock! Tock! Tock! Where is that hawk? Erf!

video embedded from Mybackyardbirding on YouTube

Read more about the chipmunk’s calls at North American Nature: What Sounds Does a Chipmunk Make?

(credits are in the captions)

The Calm Before The Crows

Fish crows at Red Hook, NY (photo from Wikimedia Commons)

30 August 2023

In August in the East End of Pittsburgh we get a taste of November dusk. It isn’t the weather or the clouds or the time of sunset. It’s a flock of more than 100 crows, a hint of the thousands to come this fall, that gather on rooftops along Neville Street before flying west to roost.

This year in early August the crows were absolutely silent but as the month progressed a few spoke out, telling me they were in a mixed flock of American and fish crows. American crows (Corvus brachyrhyncos) say “Caw.” Fish crows say a nasal “Uh-oh” (Corvus ossifragus). It’s the only reliable way to tell them apart.

American crow: “Caw Caw Caw.”

Fish Crow: Nasal “Uh oh”

video by Sayre Nature HD on YouTube

I wanted to count by species but the crows remained silent and unidentifiable through most of the month. I tried to tell them apart by sight but my focus on appearance made it impossible to count. So I stop trying. My August eBird checklists place all of them as “American crows” with an X for “Fish crows present.”

Then suddenly last Saturday they were all “talking” and about three quarters of them were fish crows. The flock continued on Sunday evening but I was too busy to count. I shouldn’t have assumed they’d be here on Monday. They were gone and they haven’t been back.

The big flocks will arrive in late October, comprised of 90+% American crows.

For now we’re in the Calm Before The Crows.

p.s. eBird’s Fish Crow Weekly Abundance map shows a dot in Pittsburgh in the month of August … and then it’s gone. Watch the animation here.

(credits are in the captions)

Who’s Singing Now?

Song sparrow singing in August (photo from Wikimedia Commons)

27 July 2023

In late July, who’s singing now?

Almost no one.

Birds sing during the breeding season to claim territory and attract mates but most songbirds wrap up the breeding season by mid-July. When breeding’s over they stop singing.

You’ll hear a handful of exceptions, though, among songbirds who nest many times each year. Song sparrows and northern cardinals raise multiple broods and have active nests in late July. Both are still singing though not as vigorously.

You won’t hear songs from birds who have finished breeding but you will hear their contact calls. Common grackles raise only one brood per year and by July they are already in flocks, sweeping through the woods and foraging on the ground.

Common grackle in flight (photo from Wikimedia Commons)

You might not see them on the shady forest floor but you’ll hear them making “chucking” sounds like this. (Note: There are additional birds making noise in the background of this recording.)

Birdsong will drop off completely next month. Take note of the few singers now.

(photo from Wikimedia Commons; click on the link to see the original)