In fact, not just the fastest falcon, the fastest creature on the planet. Under its own steam, with a little assistance from gravity, the peregrine falcon (Falco peregrinus, Dansk: vandrefalk) can reach up to 150mph (240km/hr) in a stoop. And that is a staggering number!
Cherry Hinton lies on the southern edge of Cambridge, and on the southern edge of Cherry Hinton is an ancient chalk pit known as the ‘Lime Kiln’. The Lime Kiln is a very interesting place, it’s a very large hole in the ground where the chalk has been quarried for millenia and converted to lime for building and agriculture. It’s lined with white chalk cliffs and it’s now a nature reserve managed by the local Wildlife Trust, and there’s nothing quite like it within a radius of many miles of Cambridge.
In June I had heard a rumour that a pair of peregrine falcons were nesting in the Lime Kiln. This was big news because until very recently I only saw them on the more wild and woolly parts of the UK coast where they hunt pigeons and seabirds. But in the last few years I’ve seen them fairly regularly, if infrequently, over the fields and fens of Cambridgeshire. I think the Lime Kiln must be the only rock face resembling the peregrine’s natural habitat within a 50 mile radius, which makes it even more remarkable that they found it and nested there.
To have a pair actually nesting on the edge of Cambridge was very exciting, so I paid a visit to the Lime Kiln to see if I could see them for myself. I’d been advised by a friend of the approximate location so it was fairly easy to find them sitting on the chalk face in full view, making occasional sorties into the air.
The peregrine is the fastest creature when it stoops on its prey, but it is not the fastest bird in level flight. That accolade goes to the wonderfully named ‘white throated needletail’ (Hirundapus caudacutus), which is a species of swift and can reach speeds of up to around 70mph (112km/hr) on the flat.
The peregrine’s wingspan is around 1m and the female weighs up to 1.1kg. So a bird colliding with a 1.1kg attacker travelling at 150mph is invariably going to come off second best. These awesome predators have other adaptations to protect themselves during high speed descents onto prey including a membrane which covers the eyes and baffles in the nostrils to prevent very high speed air flow from damaging their lungs.
The pair at the Lime Kiln have apparently nested there for the last three years and I believe that in their first year they raised one chick, the second year they got three away and this year they only managed one due to the dreadful weather through the springtime. But five chicks in three years is a fine tally.
I saw them over the Lime Kiln on several visits and watched them scaring the bejeezus out of the local pigeons, not during a a serious hunt, just a high speed chase on the flat, but the pigeons took it seriously and showed a surprising turn of speed too. I also saw a falcon in a stoop and another with prey in its talons which it passed to its beak whilst on the wing, which is behaviour more normally associated with the hobby.