THE PEREGRINE FALCON.
By V. R. Balfour-Browne.
3. There must be some evidence to show whether the bird is flying at its maximum speed or not.
As was recently pointed out in an interesting article[7] by Colonel R. Meinertzhagen, D.S.O.: “Birds have two speeds: a normal rate, which is used for everyday purposes and also for migration, and an accelerated speed, which is used for protection, or pursuit, and which in some cases nearly doubles the rate of their normal speed; some of the heavier birds can probably only accelerate to a slight extent. In this conclusion I am naturally excepting courtship flight, which is usually of an accelerated nature.”
To quote the words of Major C. R. E. Radclyffe:[8] “The only possible test we can accept is where two birds are matched one against the other, and we are certain they are both trying their hardest. No better test than this is the case of a hawk pursuing its quarry, when it means to one of them its food and to the other its life.”
The same writer draws attention to a common fallacy: “It is,” he says,[8] “purely a matter of optical illusion to imagine that a smaller-sized bird is flying faster than a larger bird of similar shape and make; for example, a snipe on rising ground seems to go much faster than a woodcock, similarly a teal than a duck, and possibly this may be so for a short distance, but put up the first two together, and also the last two, and let there be a peregrine after them—as I have seen many times—and the scene is amazing to a man who is not a falconer, as the smaller bird is overhauled first every time by the falcon, and presumably they are all trying their hardest.... I have dozens of times put up a peregrine over ponds and marshes where teal and ducks were sitting together, and then flushed the wild fowl all simultaneously. In every case without any exception the first bird overhauled and brought to the ground has been a teal and in the case of a long flight, when every bird has been flying for its life, the further they go the further the teal lag behind the wild ducks. The same remarks apply to woodcock and snipe, to black game and grouse, to pheasants and partridges—all of which I have flushed simultaneously in front of hawks.”
In dealing with the same point in a letter written to me, Major Radclyffe makes the following interesting observations:
“... Few people realize that a pheasant flies much faster than a partridge when they have both been going a short distance. If you flush an old cock pheasant and a covey of partridges together in a big field of turnips, you will see the partridges are quickest ‘off the mark’ and away with a bit of a lead, but the pheasant will catch them, and be first over the fence if they have 200 or 300 yards to go.
“Again take as an example a woodcock and a snipe. I have several times flushed these two birds together, and in no time the woodcock has left the snipe far behind him, and yet I believe that ninety-nine sportsmen out of a hundred would say the snipe flies faster than the woodcock.