Re: Peregrine stategy

To: Birding-Aus <>
Subject: Re: Peregrine stategy
From: Paul Taylor <>
Date: Sat, 14 Jun 2008 12:33:26 +1000
I'm not suggesting that you can do this but the force could be
> estimated by calculation using a 500g mass stooping at between
> 160 to 440 km per hour.

The actual contact velocity will be less that this as the Peregrine
moves from the aerodynamically "clean" stoop position to bring its
feet to bear on the prey.  Knowing the breaking strength of the bones
of the feet and legs would set an upper limit to the impulse ("force")
that could potentially be applied.

> 'May grasp smaller prey, but MOSTLY STRIKES WITH LOOSELY BUNCHED
> TOES and rakes with hind claw ...'

I'm curious to know how this was determined; studying a bird attacking
a lure close to the ground, for example, is a very different environment
to a stooping attack at altitude.  Unless the Peregrine is a one-trick
pony, several different attack methods may be used to suit the situation:
low speed, snatch and grab; medium speed, slash (or spear?); high speed,
kinetic strike.


   Paul Taylor                                  Veni, vidi, tici -
                           I came, I saw, I ticked.

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