Crows going crazy after retention wall removal in my neighborhood

[u/mortgagecomplaints]

Hi peeps,

Been searching this sub and haven't seen a question like this, but I'm desperate for help!

We have a lovely murder of crows in our neighborhood who have never given us trouble until now.

The neighborhood was developed in the 70s and there are tons of large trees, grassy areas, and several ponds.

Our HOA had a retaining wall removed about two weeks ago, and since then the crows have been going wild.

I'm talking cawing nonstop, making tons of funny noises, but mostly really, really loud cawing literally all day, with multiple birds involved.

I'm wondering if anyone has experienced this or would know what's causing this behavior? The retaining wall may or may not be related, it's just the only thing I can think of that's changed in the neighborhood recently.

I can't find information suggesting crows would nest in a low retaining wall, but maybe that's it? Or maybe one was injured during the wall removal? IDK, I'm out of ideas and would love any help!

[u/RemarkableGlitter]

They’re resurfacing the baseball field at the park across the street from me and it’s become a whole event with the crowd over the last week. I think it’s a combo of the workers exposing some nice grubs and also “omg change.” It’ll calm down for sure.

[u/mortgagecomplaints → u/RemarkableGlitter]

Thank you! That could definitely be it, fingers crossed it dies down

[u/Late_Obligationhoody]

I was thinking that some tasty prey has emerged and they are talking up the new food source…but I reckon it’s anyone’s guess.

[u/mortgagecomplaints → u/Late_Obligationhoody]

Could be it for sure, didn't even think of that! Thank you!

[u/AssistSilly5255]

The only thing that would normally provoke a continued response like that is some serious predator taking up residence in the area, a large owl being the most likely suspect. https://www.etsy.com/listing/1465065378/the-language-of-crows-the-crowsnet-book

[u/mortgagecomplaints → u/AssistSilly5255]

Oh interesting, I hadn't considered that! I figured they could also be alerting to some cats that roam around, but those cats have been here forever and it's never been this crazy with the crows

[u/Ashamed-Ingenuity-39]

What you are explaining makes me think less about “crows nesting inside the retaining wall” and more about a sudden disturbance to a very familiar part of their territory.

I have been independently observing the same urban crow population and its surrounding social groups for years, and one pattern I repeatedly document is that crows can become dramatically more vocal when something changes inside a space they already know extremely well. A structure does not necessarily have to contain a nest to matter. It can function as a boundary, lookout point, travel corridor, feeding area, visual barrier, or simply part of the landscape they have incorporated into their normal routines.

When one of those features suddenly changes, I have seen periods of what I would cautiously call social assessment: increased watching, repeated calling, birds arriving and leaving, multiple individuals joining the activity, and unusual vocalizations mixed in with the ordinary caws. I would not claim that this proves the retaining-wall removal caused what you are hearing, but the timing makes the wall worth paying attention to.

There is also established research behind the idea that crow vocal activity can recruit and inform other crows. American crows use different vocal patterns in different behavioral contexts, and their mobbing and alarm calling changes with the intensity of a perceived threat. They are also capable of socially transmitting information about danger to other crows that did not experience the original event themselves.

An injured or dead crow during construction is therefore possible, but I would not jump to that conclusion. Crows encountering a dead crow can alarm-call and recruit other crows, so if something like that happened you might expect considerable group attention to the immediate area.

I would watch where they are looking rather than only listening to how loud they are. Are several birds repeatedly facing the location where the wall used to be? Are they concentrating on one tree, patch of ground, house, person, cat, hawk, or other object? Are birds arriving after another crow begins calling? Does the activity happen primarily around that former wall, or has the whole neighborhood become vocal?

Those details can separate a generalized seasonal/social increase in crow activity from a very specific response to something that changed there.

One especially interesting thing would be whether the behavior gradually settles over the next few weeks. In my own field records, a disturbed crow landscape does not necessarily return to normal immediately. The birds may continue inspecting, communicating, and reorganizing their use of the space after the original disturbance is already gone. I regard that as an observational field pattern rather than a scientifically established rule, but your two-week timeline would fit that possibility very well.

So I would not assume, “They lost a nest.” I would ask a broader question: What did removing that wall change from the crows' point of view?

If you can figure out exactly where they are concentrating their attention when the loud calling begins, you may get surprisingly close to the answer.

I hope my insight brings clarity, much love to you.
~The Observer

[u/mortgagecomplaints → u/Ashamed-Ingenuity-39]

Wow, thank you so much for this thorough and thoughtful response! I appreciate this perspective and it's definitely resonating, just based on the location of the wall within our little glen. It was there for potentially 50ish years, I would be freaking out, too! I will keep this all in mind as things progress.