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A Massive Ball of Birds

11/16/2012

4 Comments

 
A couple years ago in early summer I was outside cooking some burgers on the BBQ and enjoying the nice weather we were having.  It was a fairly active afternoon and there were lots of birds around feeding and singing... a great opportunity for observing a variety of bird behaviors. 

This was fairly early on in my bird language explorations but I had been listening a lot and had begun to figure out how to tell the difference between when the birds are in their baseline activities versus when they're agitated about something.  So when the feeling of the landscape started to shift I knew something was going on. 

Suddenly it seemed like every bird in the whole area had been drawn to the back of my property and were now alarming in amazing numbers.  I heard robins, flickers, chickadees, goldfinches, sparrows, juncos and several other species that I didn't even recognize.  Something intense was happening. 

I left the burgers in the care of a responsible party and ran out to the woods to see what was happening.  I moved quietly through the trees and bushes following where the sound was coming from.

When I got to the back of the property the sound was immense.  I knew it was just a little bit further before I would be in sight range of whatever was causing these alarms. 

I had to get on a sneak trail that went between thick fir trees & the neighbors fence but eventually managed to find a clearing where I could see out across a lawn to spot the culprit.  It was a big Northern Goshawk perched just below the canopy in a red maple tree. 

This was the first time I had ever successfully used bird language to spot a predator.  I was thoroughly thrilled and amazed to witness this incredible scene. 

I zoomed out my gaze to watch the ball of birds surrounding the hawk and was struck by how geometrical it was.  The consistency with which they kept their distance and the sheer quantity of birds involved in the alarms made it really clear to me that alarms really do have a shape. 

After watching in awe for a few minutes I knew the food would be getting ready so I decided to head back to the house.  All the way back I could still track the sound and hear the rising and falling intensity of the birds surrounding the hawk.

The alarms continued for a few more minutes and then the hawk must have flown off because the birds started to settle down and re-initiated their feeding frenzy.
4 Comments
Liz
1/4/2013 10:05:04 am

do you think the roosting behavior with balling is similar?

Reply
Brian
1/5/2013 01:16:25 am

I'm not exactly sure what you're referring to when you say "roosting behavior with balling" Can you describe the behavior?

Anytime large groups of birds gather together it has the potential to look like a 'ball of birds' but what distinguishes the example in this story is that the distance from our predator bird was consistent.

The hawk was both drawing birds in as well as making them maintain their distance, so the "shape" of the alarm was very localized and resembled a big hollow ball with the hawk in the center.

When birds gather to roost the focus of their gathering isn't a predator so it looks a bit different. Does that answer your question?

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Calvin Roberts
10/1/2014 05:11:55 am

So awesome to here about this Brian. Could you describe the bird attitude in depth a little more?

Reply
Brian
10/1/2014 10:55:23 pm

Do you mean the hawk's attitude? It's interesting, I'm not sure if it was hunting or just scoping things out. It didn't seem super interested in the songbirds, but maybe looking for nests or unwitting red squirrels. Not immediately menacing, but definitely purposeful.

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