• BirdForum is the net's largest birding community dedicated to wild birds and birding, and is absolutely FREE!

    Register for an account to take part in lively discussions in the forum, post your pictures in the gallery and more.

Hobby Thread 2009 (1 Viewer)

bitterntwisted

Graham Howard Shortt
I was just musing about the number of Swifts, Swallows and Martins our Hobbies take over the course of a summer.

An estimate of perhaps 10 birds a day for each pair may be plausable ( ? )

Hobbies are in the UK for around five months - approx. mid April to mid September - that's about 150 days.

According to the RSPB there are approximately 2,200 pairs.

If you do the maths 10 X 150 X 2,200 - that comes to three million, three hundred thousand birds !

Anyone have a view on that ?

10 seems like a very high figure per pair per day. Also, from what I've seen, they catch birds mainly while breeding to feed young. On arrival they seem content to dine on insect prey caught while hawking, so the 150 days is also probably very high.

Graham
 

Cheshire Birder

Well-known member
I was just musing about the number of Swifts, Swallows and Martins our Hobbies take over the course of a summer.

An estimate of perhaps 10 birds a day for each pair may be plausable ( ? )

Hobbies are in the UK for around five months - approx. mid April to mid September - that's about 150 days.

According to the RSPB there are approximately 2,200 pairs.

If you do the maths 10 X 150 X 2,200 - that comes to three million, three hundred thousand birds !

Anyone have a view on that ?


Even if that is a large overestimate, its still going to be several hundred thousand birds taken. Just goes to show how much loss in population a raptor can have.

CB
 

Rob Smallwood

Well-known member
Changing subject - my limited experience of Hobby with young is that they check out anyone close to the young - I think that on site they will do this as a matter of course...
 

halftwo

Wird Batcher
Well this has been busy overnight!
Well done on the garden tick, Graham.

Just a quick comment re numbers of birds caught: I think that estimate is far too large as well.
Mostly for a large part of the season insects are the main prey. May, June & half of July then.
After hatching until they leave (8 weeks) perhaps an average of 10-20 birds a day between the family (?) = c.1,000 birds. (if my maths is right!) And these will be of a varety of species - though probably more than half will be Swifts.

Anyway - another excellent morning - see next post.
 

John Barber

Well-known member
Interesting H, but that could still amount to over two million birds between the 2,200 pairs.

I note from an old bird book that there were only an estimated 100 pairs of Hobbies in the UK around 1980 ( don't know if that's correct or not ) If it is, then the large increase in the Hobby population over the last three decades may partially explain the decline of Swifts and Swallows. And remember, we are only talking about birds taken in the UK.
 

halftwo

Wird Batcher
July 25th. Male Takes a Swift

08:30 - 09:20

Sunny & warm, light wind, partly cloudy.

Set up the 'scope and just the youngsters on the nest - now visibly grown and, as mentioned, now showing brown feathers coming through the white down. They're now c. a fortnight old - half way there.

The sky relatively empty - though scanning around reveals the usual specks of Swifts - in loose groups high in the blue and white.

I didn't have long to wait. Swallows' soft alarns, barely audible, fell down on me from way up. Peering into the vastness of the sky I could see only Swifts - but as I watched they began to turn, compass points all, my way, and flee overhead.

And, in their wake, a boomerang of dark falcon sliced the air.

But these Swifts kept their distance - and a turn to the west overhead took the Hobby away to others more complacent.
With wings swept back and rapidly flicking his primaries, he built up his speed as he closed like a missile on another group of Swifts a thousand yards distant.

Getting amongst them as they scattered in arcs he began a series of curves and dives, power rises and loops - I thought they had all evaded him. But one wasn't to be so lucky.

A turn towards my position brought both predator and prey nearer. The Swift had been separated from the flock. The Hobby locked on and closed in, sweeping at it twice and missing: but he had the measure of his prey.
With a whiplash dive and up-curve as the Swift desperately dodged, Hobby and prey snapped together and the falcon stood in the air, holding the still-spread Swift in his talons.

He turned and began an accelerating glide straight to the nest tree, the Swift held below. As he approached, suddenly, there was his mate - both still way up against a beautiful pillow-meringue of cumulus billowing in the blue - and she met him there and deftly took the Swift, and both zipped a long line like arrows to the trees.

Well they both landed out of sight - but she was soon at the nest and feeding those growing heads.
I found him later on a different tree nearby; sitting handsomely in the morning sun.

Does birding get better than this?
 
Last edited:

username

Well-known member
Hobbies responsible for low numbers of swifts??! Blimey...don't give 'those' anti-predator nut jobs any more 'ammo' to fire at raptors for gawds sake! As with many population 'dips' in bird species...there are usually a number of coinciding factors involved....that aside...
Did my usual this morning....'walked the line'..[johnny cash like]!...but still no joy on the hobby front. A good morning tho. I have found that there are many side benefits from looking for these raptors locally. By chance...roaming into different area's...discovered a 'new' little patch of habo and found 'another' reeling grasshopper warbler! You may recall earlier in year i posted about this species being new in the area...having been absent for many years. So i am a reasonably happy bunny...even without my 'invisible' hobbies!

ps...great report H2...doesn't get much better! Happy hunting all.......
 

John Barber

Well-known member
Last Word On Numbers ?

When I became interested in my local hobbies and started to read up on a few facts, I wondered why the UK population seemed so relatively low.

Obviously, there's the human factor, which affects virtually all animal and plant species on this planet, and then there are the specific dynamics that come into play between a particular predator and it's prey.

It's only when you sit down and think about the potential numbers equation that you start to realise 2,200 pairs may actually be as many hobbies as the UK prey population can reasonably support. 4,000 pairs for example, could be completely unsustainable.

It's just a case of being interested in the bigger picture.
 

John Barber

Well-known member
Sunday Report

Didn't expect to get the chance to visit the Hobbies today but an expected trip to Gloucestershire wasn't required.

14.20 - 15.50

Leaden skys and light drizzel didn't exactly pose the best invitation to get out of doors today, but I had a spare hour, so off I went.

As I parked the car, a cloud of swallows danced a hundred feet above me -was this to be a good sign ?

Standing in the viewing meadow, the first indications were not too optimistic. A strengthening southerly breeze, low visibility, increasingly heavy rain and and no sign of either adult bird - things seemed a little bleak.

Despite scanning the heavens in all directions for half an hour - using a procedure I now call the Hobby Twirl - basically this entails standing in one small spot in a large field and endlessly revolving around until there's a nice patch of worn muddy turf under your feet ( yes, you do have to be bonkers ! ) nothing was to be seen.

Then, all of a sudden, there was a commotion over the nearby farm buildings. A flock of swallows were mobbing a kestrel which had come too close for comfort. It soon departed with a flea in it's ear.

Forty five minutes and still no sign of the Hobbies, but the Kestrel suddeny reappeared 70 yds to the front and left of the nest tree. During the next five minutes I watched in detail through my straight scope, marvelling at this exquisite bid quartering the meadow and hedgerow. I hadn't noticed but the Kestrel had now moved closer to the nest tree - and I think you know what's coming next - out of the trees from the right a rocket suddenly exploded - the male Hobby ! Pulling up within a few inches from his falcon cousin, the startled Kestrel veered quickley away to safety. The Hobby certainly doesn't stand any nonsense from interlopers and the Kestrel was certainly having a hard time of it, one way and another.

Immediately upon seeing off the Kestrel the male flew to the top of his perch tree, sitting in full view and facing in my direction. I couldn't believe my luck. This was easily the best view that I had had of either bird. I was able to study him in detail, his yellow feet, rufous thighs, heavy streaks and black moustache - perfect. He stayed for several minutes before disappearing back into the trees and I thought that was that.

A few seconds later he suddenly appeared on the nest, the chicks immediately responded, looking for food, mouths open - but the male had nothing to give them. I felt quite sorry for them really, the were obviously hungrey, pecking at the adults chest, and he making almost apologetic nodding motions towards them; as though he was saying, don't worry, mum will be along with some food soon.

And then, almost on cue, I heard a call over my right shoulder - a quick Hobby Twirl - and there she was. Flying maybe 30 feet high, I could clearly see through my binoc's that she was clutching a swift. She headed to her normal rendezvous point to the right of the nest site. And then, in a blurr, the male flashed up from the left, he must have come straight from the nest, and the pair tumbled in mid air - a food pass - and I'd seen it ( I think ! )

Three minutes later, and the female entered the nest and started to feed her ever growing chicks. Their long wait for food was over.

Those Hobbies are some team.

The rain was heavier by now and so it was time for home. But I was well chuffed.
 

halftwo

Wird Batcher
Great stuff John, I'm just back from an even wetter Burton on Trent - Marsh tit my only consolation. (Other than the company and the champagne!)
 

halftwo

Wird Batcher
July 27th. Joint Hunt Success.

10:30 - 12:15

Cool, lots of cloud, showers, winds lightish.

A crowd of Swifts all heading one way to the east of me: one of the Hobbies was up there somewhere. At the trees neither in sight initially - but then he appeared on the perch tree - so maybe he'd just returned from a foray.
But at the nest only chicks - one bobbing its head like it was trying to swallow an awkward lump.

A few minutes and a cry goes out - but no sign of either parent bird now. Then he flies the gap and lands out of sight. Cue the farmer down the track - too close for them to remain on perch: sure enough she had sneaked out and risen, and was now heading south over to my right.

She thermalled lazily, caught a few insects with deft rapid movements of just one foot - and straight to beak, then circled overhead back north, gaining further height until just a speck against the grey.
Lazy turned to animated and soaring wings narrowed to arrows.

From way way up the long dive began. I saw the Swift long after she. By then her speed was - well: pick your own superlative.
The Swift was corkscrewing down daemonically, but she seemed to be forcing its turns: beginning hers before the prey's. Three times a flick-flack of instantaneous ninety-degree changes in direction: flick-flack: underside then topside showing as both raced towards the ground. Flick-flack and back again as the treetops now hid the chase from view.

Seconds later she was rising again: the Swift had escaped. The chase had lasted perhaps ten seconds and had begun at a nearly a thousand metres.
The speeds appeared impossible. But she merely carried on, now powering her way back up to bluer sky.

Now heading south, and she had company. Her mate joined the foray. For the next hour and more I watched the two of them co-ordinate a series of reconnoitering meanders through their territory. All points of the compass were put to use - and I had them in sight for the whole.

Their hunt took them to great heights - at one point directly over me I lay on my back to watch, at others they were just a hundred feet up. Several times the male would begin a shallow accelerating dive that came to nought. But one synchronised dance held me spellbound again.

Heading over to a local House martin colony they first tried for some Swifts. There were maybe fifty or more in a loose flock. The male Hobby powered up to them as they began to evade, the female was above and behind her mate, closing the gap. A quick series of twisting slices at the Swifts and then they turned their attention on the martins.

Co-ordinated loops, circles, arcs as first one, then the other Hobby stooped and looped, trying to force prey into the path of the other, time and again at lightning speeds they struck - but unsuccessful again. Time to soar once more.
Back they came to rise and threatening to vanish against the sun, each caught an insect or two. Then off to the west again - and this time zipping down to low-flying Swifts. They were heading away and brushing the horizon as I saw one of them flying at a level flying Swift - simply catching it up and plucking it from the air.

Then something I've never witnessed before. As I watched the Hobby that had hit the Swift was slowly circling with it beneath her (it was she) and began to pluck it in the air!
Feathers drifted down as the Swift was brought forward in long legs to the bill, then neatly tucked under her tail again. She made no attempt to go to the nest, remaining in the air and plucking the prey; then flew to a near tree to eat some of it.

A minute later she came straight back to the nest with the remains - where she began to tear it to pieces for her young. She had been away from the nest for well over an hour. Her mate? Still out there in the sky, still on the prowl for more meat.

As the next shower began to fall I left the chicks to their hard-won meals.
Once again the privelege of being a part of all this has stunned me.
 
Last edited:

SueO

Well-known member
Champagne?? What a great idea. I think you Hobbiests should plan a brunch picnic. You can sit in your camp chairs, drink champagne and have brie and prosciutto(?) croissants while you watch the little family. Civilized birding. You could even find a log or boulder to rest and elevate your foot H.
 

halftwo

Wird Batcher
That would be advertising the site a little too much, I think, Sue! We're watching from a footpath.
Nearly time for a sundowner, here though, anyway (give or take): certainly over the yardarm (whatever one of those is!(?)

H
 

SueO

Well-known member
H, Another peerless report today I see.

Sue, Can I be curious and ask where in the world you are ???

Anchored in Spanish Water, Curacao, Netherland Antilles. We should have been in the San Blas Islands by now, but we were lazy and slow going through the West Indies Islands. Now it's hurricane season and even though hurricanes aren't supposed to come down this far, I don't want to sail until the season is over. We are putting Peregrine on the hard next week and flying home (California)for a few months. We will head for the San Blas and Panama in November.
 

Gretchen

Well-known member
Since I am having a chance to be a virtual hobby watcher (thanks to the RSPB), I have an observation to throw in, and wonder if anyone can see what's going on in other nests to compare.

The new forest mother (I believe) still seems to constantly cover the young bird. I wonder if she's keeping it warm or just hiding it (since it is still mostly a conspicuous white color).

Anyway, it looks like it's really a challenge to keep her wings covering the chick as it has gotten so big. I wondered if hobbies with two (or more?) chicks would be still trying to do the same, or if they would have to have given up by now?
 

halftwo

Wird Batcher
Hi Gretchen,

I've no knowledge - except seeing my pair - which, I think are two or thee days advanced on the New Forest birds - so maybe in the next day or two you'll see the female leave the nest increasingly.
It's probably weather dependent too: currently raining here with much more on the way - don't know if I'll be out there today.

H
 

Users who are viewing this thread

Top