Canada Goose Cull

To: "'Birding-Aus \(Forum\)'" <>
Subject: Canada Goose Cull
Date: Sat, 20 Jun 2009 16:48:10 -0700 (PDT)
--- On Sun, 6/21/09, Philip Veerman <> wrote:
> Birds crash into large buildings too and buildings are a lot
> bigger and slower moving than planes.

Although from what I've seen, birds usually hit windows which either permit a 
view through the building or reflect the outside world making the bird think 
there is no obstruction. :)

Belinda wrote:
> One wonders why the birds don't take the evasive
> action.  Surely a loud, large plane bearing down
> is hard to miss, and birds have considerably
> better maneuverability than a plane.

Let's suppose a jet is flying at a takeoff or landing speed of around 275Kmh.  
That's 76m per second - so it will cover half a kilometre in 6.5 seconds.  In 
the case of the Hudson flight, it had actually just taken off, so it could have 
been travelling at a higher speed. Most of the noise of the engines goes out 
the back where the thrust goes.  The plane was probably approaching the birds 
from behind and underneath - making it less likely for the birds to see it. 
Also, the geese were flying in formation and would not be expecting to avoid 
anything or break formation at a height.

When you combine all these things and consider that birds often fail to avoid a 
car travelling at a much slower speed (I remember reading a New Scientist 
article which explained this in terms of how bird eyesight works)... The amount 
of time for the birds to react was probably small...

In short - there's lots of reasons why the birds might not react in time.


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