Eagle/Heron/Crow/Gull Interaction

The following questions were sent to David Hancock from Chris Rickwood:

I’ve just seen a spectacular wildlife event.  It was about 2pm on Tuesday 2008-Jul-08 on White Rock’s East Beach.  I heard a bird at the edge of the water giving a loud cry which sounded like “craaak”.  The bird was a blue heron.  It was being attacked by a bald eagle.  The heron flew along the coast for a short distance and then it seemed to have found a thermal.  It started circling upwards with the eagle following.  By this time, two other birds had joined the fray.  One was a crow and the other was a gull.  Both the crow and the gull started harassing the eagle.  They buzzed it but didn’t seem to make actual contact.  (The eagle completely ignored them.)  The heron kept rising in the thermal and slowly the eagle fell behind.  Eventually the eagle gave up the chase and the crow and the gull flew away.

This raises some interesting questions:  Was the warning cry given by the blue heron a universal cry which all bird species respond to?  Are all birds capable of giving this same warning cry?  Why would a crow and a gull come to the assistance of a blue heron?  Do all birds assist other bird species when they are under attack?  Was the bald eagle trying to kill the blue heron or trying to force it to regurgitate its prey?  Does the bald eagle make a habit of trying to force other birds to regurgitate fish (like a frigate bird)?  How can a heron out-climb an eagle?  - Does it have more powerful wings or a larger wing-area or a more efficient glide?

Chris Rickwood

Here is David Hancock's reply:

Hi All:

RE:  Eagle / Heron / Crow / Gull!

Great observations and well told.

I think what you witnessed is quite typical but getting all the elements together and witnessed -- quite an opportunity.

Bald eagles will hunt herons but I think you hit the nail on the head.  I suspect the eagle saw the heron nab a fish and attempted to cause it to be given up. Much of the eagles' summer food is derived this way.  Usually they watch the crow find the intertidal midshipmen in the grass and, when the crow reveals a big enough one, the eagle swoops in and takes it.  They regularly do this with herons as well. 

At the dump where the gulls and crows do the scavenging for food it is the same. When they turn up a large item they can't immediately swallow, one of the eagles is in like a bird dog to steal it.

With the small turning radius the crows can attack the eagles with impunity.  They have learned that they are vulnerable in the 4-6 days before fledging and never forget that experience.

You are quite right about the calls.  Just as I always know the call of a gull when it calls out, "Eagle", other birds will be even more sensitive to this.

In your incident, like most, the eagle seems to have not succeeded. But enough eagles, crows, gulls and herons seem to succeed so that all are surviving and doing very well.




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Authored by: Anonymous on Wednesday, July 16 2008 @ 06:22 PM EDT Eagle/Heron/Crow/Gull Interaction

What an interesting experience with the eagle, heron and crows.   David's answer certainly clears it up but I have one more comment/experience. I sent the photos to David of the bald eagles on Gabriola eating the dogfish shark that one of them had swum to shore.  In the photos there are crows being opportunistic about the opportunity for a snack and literally standing practically between the legs of the eagle...seemingly with no bother on the eagle's part.   I have to assume that the eagles will kill and eat crows if they are hungry...as a food source but not just because they annoy them.   The eagles obviously had more food than they could eat at the time so the crow was not looked at as potential dinner.

I also have seen the local bald eagles sitting in their favorite tree by the waters edge and watching the local otter family fishing. They will sit there and wait until the otter has caught something particularly delectable and then swoop down and steal it.  The otters dive out of the way into the ocean and then generally just go about their business.  It is a fact of life for them.


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Authored by: Anonymous on Wednesday, August 14 2013 @ 06:05 AM EDT Eagle/Heron/Crow/Gull Interaction
In the photographs there are crows being entrepreneurial about the chance for a nibble and truly standing basically between the legs of the eagle seemingly with no trouble on the falcon's part.The hawks clearly had more sustenance than they could consume around then so the crow was not taken a gander at as potential supper. these kind of activities should be promoted.Regards. how i make money online
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Authored by: Anonymous on Monday, April 14 2014 @ 05:45 AM EDT Eagle/Heron/Crow/Gull Interaction
It is amazing to read about this kind of interaction between species! Dubrovnik yacht charter
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Authored by: Anonymous on Monday, April 14 2014 @ 06:46 AM EDT Eagle/Heron/Crow/Gull Interaction
Where can we see more about this interaction, I want to see a video maybe! www.yachtbooker.ru
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Authored by: Anonymous on Wednesday, April 16 2014 @ 07:36 AM EDT Eagle/Heron/Crow/Gull Interaction
Does it have more powerful wings or a larger wing-area or a more efficient glide? here
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Authored by: Anonymous on Wednesday, April 16 2014 @ 07:37 AM EDT Eagle/Heron/Crow/Gull Interaction
Bald eagles will hunt herons but I think you hit the nail on the head. link
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Authored by: Anonymous on Saturday, April 19 2014 @ 11:35 PM EDT Eagle/Heron/Crow/Gull Interaction
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Authored by: Anonymous on Tuesday, April 22 2014 @ 05:35 AM EDT Eagle/Heron/Crow/Gull Interaction
Just as I always know the call of a gull when it calls out, "Eagle", other birds will be even more sensitive to this. oceanis 34 beneteau
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Authored by: Anonymous on Saturday, June 07 2014 @ 11:08 PM EDT Eagle/Heron/Crow/Gull Interaction
love pets especially when they are young. Though eagle appears to be scary ,it is really a sweet bird. How do you manage Pengertian , kata lucu , kata bijak
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Authored by: Anonymous on Saturday, June 07 2014 @ 11:09 PM EDT Eagle/Heron/Crow/Gull Interaction
Your post had offered me with another point of view on this subject. I had limited knowledge that things can work in this manner as well. Thank you for sharing your knowledge kata cinta , kata mutiara , kata romantis
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