a few years ago a Brown Goshawk hit a neighbours window. it had a
broken neck by the way its head flopped when I picked it up an hour
or so later.
Peter
On 14/06/2008, at 10:22 AM, Stephen Ambrose wrote:
It is interesting to hear that Peregrines have the capacity to hit
with such
force that they can break their prey's neck. Peregrines dive at
such speed
that I do not doubt this.
Interestingly, in a study of bird impacts with towers and windows,
Veltri &
Klem (2005), nearly all bird mortalities were as a result of
substantial
haemorrhaging in the brain (resulting from the impact) and less
than 11% had
skeletal fractures. Most notably, no cervical (neck) fractures or
dislocations were found in the 502 bird specimens that were examined.
Therefore, I wonder if a bird struck by a Peregrine from above
actually dies
from brain injuries resulting from the force of the impact, or from
a broken
neck. Perhaps the neck is more susceptible to breaking if impacted
from
above and with potentially greater force (as in the case of a
Peregrine
attack), compared with being impacted from the front of the head
and with
potentially less force (in the case of a collision with a barrier).
Stephen Ambrose
Ryde, NSW
Reference:
Veltri, C.J. and Klem Jr, D. (2005). Comparison of fatal bird
injuries from
collisions with towers and windows. Journal of Field Ornithology 76
(2):
127-133.
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