Bird mortality

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landrew
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Bird mortality

Post by landrew » Sat Jul 21, 2018 5:28 pm

Recently I had some extra time on my hands, and from the third floor of a concrete building, I could hear frequent thumps, similar to what it might sound like if someone were bouncing a tennis ball off the building. Since this wasn't possible at the third floor, I investigated, seeing that a good number of songbirds were crashing into the building in mid-flight. I didn't see any hitting the window, so I assume they were hitting the walls. The collisions peaked early in the morning, and tapered off later in the day.

What this seems to suggest is that many birds are not adapted to avoid flying into walls. The relative brain size of birds varies considerably between species. I don't know how many birds survive the collisions, or how many die, but many birds have a prolific birth rate, therefore a high degree of bird mortality is expected. I suspect that a number of predators quickly take care of the dead carcasses that might otherwise be lying around.

I think it would serve some members of the public to better understand population dynamics, and not to react emotionally to every dead or injured bird, as though it might be related to an extinction event.
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Re: Bird mortality

Post by Gawdzilla Sama » Sat Jul 21, 2018 6:03 pm

True. The claims that wind generators kill "lots of birds" has the problem of not counting non-wind generator deaths.
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Re: Bird mortality

Post by Lance Kennedy » Sat Jul 21, 2018 9:24 pm

Birds fly into windows, not walls.

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Re: Bird mortality

Post by Gawdzilla Sama » Sat Jul 21, 2018 9:37 pm

Lance Kennedy wrote:Birds fly into windows, not walls.
Unless they fly into walls, yes.
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Re: Bird mortality

Post by Lance Kennedy » Sun Jul 22, 2018 5:28 am

Kinda funny, really, but birds have this extra sense, based on two structures called "eyes " which stops them flying into opaque objects like walls. At least most of the time. Almost paranormal.

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Re: Bird mortality

Post by Gawdzilla Sama » Sun Jul 22, 2018 10:04 am

I saw an entire flock of seagulls fly into the island on a carrier once. They had to muster a working party to clean that mess up.
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Re: Bird mortality

Post by OlegTheBatty » Sun Jul 22, 2018 4:16 pm

Some birds aren't always looking where they are flying.

Just because birds have eyes doesn't mean they use them the same way we do, nor that they perceive as we do.
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Re: Bird mortality

Post by landrew » Sun Jul 22, 2018 6:51 pm

Gawdzilla Sama wrote:I saw an entire flock of seagulls fly into the island on a carrier once. They had to muster a working party to clean that mess up.
"Follow my leader."
Maybe the one leading isn't always the most qualified to lead.
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Re: Bird mortality

Post by Gawdzilla Sama » Sun Jul 22, 2018 7:24 pm

landrew wrote:
Gawdzilla Sama wrote:I saw an entire flock of seagulls fly into the island on a carrier once. They had to muster a working party to clean that mess up.
"Follow my leader."
Maybe the one leading isn't always the most qualified to lead.
Why do you think they were in a single line? Because that would fit your paradigm?
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Re: Bird mortality

Post by landrew » Sun Jul 22, 2018 7:32 pm

Gawdzilla Sama wrote:
landrew wrote:
Gawdzilla Sama wrote:I saw an entire flock of seagulls fly into the island on a carrier once. They had to muster a working party to clean that mess up.
"Follow my leader."
Maybe the one leading isn't always the most qualified to lead.
Why do you think they were in a single line? Because that would fit your paradigm?
It was double entendre for what's happening in other spheres of discussion on here.
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Re: Bird mortality

Post by Gawdzilla Sama » Sun Jul 22, 2018 7:33 pm

No, it was just an assumption on your part.
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Re: Bird mortality

Post by TJrandom » Sun Jul 22, 2018 7:56 pm

I have seen birds fly into roofs. I just assumed the reflection looked like open sky.

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Re: Bird mortality

Post by Lance Kennedy » Sun Jul 22, 2018 8:01 pm

It is rare for birds to fly into anything opaque. I have never seen it happen. On the other hand, I have seen birds fly into a window many times. Windows are known go be major bird killers.

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Re: Bird mortality

Post by Matthew Ellard » Mon Jul 23, 2018 3:22 am

Lance Kennedy wrote:Windows are known go be major bird killers.
As Confucius said "Man in glass house should not keep budgies" :D

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Re: Bird mortality

Post by Gord » Mon Jul 23, 2018 6:00 am

Gawdzilla Sama wrote:No, it was just an assumption on your part.
I thought it was a Trump joke.
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