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Tag Archives: mixed-species feeding flocks

Party Season

08 Tuesday Oct 2019

Posted by theresagreen in bird behaviour, birds of Wales, Bryn Euryn Nature Reserve, Nature of Wales, woodland birds

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Tags

bird behaviour, Blue tit, coal tit, foraging party of birds, goldcrest, Great Tit, long-tailed tit, mixed-species feeding flocks

Party season has arrived in the woodlands once more: the time when many of the more sociable and colourful of our smaller bird species temporarily put aside territorial squabbles, joining together to form a foraging cooperative and sweep through the trees en masse on unified hunts for prey. Variously referred to as ‘mixed-species feeding flocks’, ‘mixed hunting parties’ or less formally a ‘bird wave’, all describe the structure and purpose of these entities, but none can convey the vibrant energy that accompanies the birds on their whirlwind woodland tours.

September 26th

Bursting out from the woods, scattering into all parts of the Wych Elm like popping corn, excited Blue Tits immediately begin picking their way around the leafy twigs. There are a quite lot of them, too tricky to count accurately as they are so mobile. Blue Tits are numerous here and you rarely have to go far to see or hear one or more, so this could well be several local neighbouring families that have joined forces.

Foraging party member-Blue Tit

Seconds behind them dainty Long-tailed Tits appear, much gentler in their approach but then suddenly they’re everywhere, there must have been at least 12, maybe more.

Foraging party member- Long-tailed Tit

I realise I’m being treated to a close-up, eye-level view of a travelling foraging party! I wish I could better convey the excitement and energy transmitted by these little birds that I felt even through my double-glazed kitchen window, it’s quite magical. I’d have been happy with just the Blue and Long-tailed Tits, but then there are Great Tits too;  only three that I can see, one of which is a smartly feathered juvenile, similarly coloured to the adults that arrived with it but not as brightly yellow. Again, probably a family.

Foraging party member- Great Tit

Birds continue to arrive, more Blue Tits, long-tailed Tits and then two Coal Tits, one of which perched on the end of a leafy twig and launched itself at the window, fluttering madly as it inspected its corners and joints for hiding insects or spiders.

Foraging party member-Coal Tit

Then just as I thought the last of the party members had arrived there are two Goldcrests. They are tricky to focus on as one seems to be chasing the other at speed through the tree branches. They may be our tiniest birds, but they’re quite feisty.

Most of the birds stay within the cover of the trees, but a few more adventurous ones venture over to check out parts of the building too. I already mentioned the Coal Tit coming to my window, but others were exploring the metal fire escape, which permanently in shade tends to have a coating of algae and lichens.

Blue and Long-tailed Tits tend to be the bravest, and where one bird ventures others follow to see what they’ve found, including a curious Goldcrest. Slightly below the level of my windows, I got to see the birds from some interesting angles,

FORAGING FLOCKS

These travelling foraging flocks typically have a core species around which others gather, typically Tits. Here I’m sure that Blue Tits are the central characters as well as being their most numerous members. They seem to lead or guide the flock and so are the first to arrive in a chosen foraging spot when they’re on the move. Other species accompanying or following them are known as attendants and they tend to join the foraging flock only when it enters their territory. Attendants may be other insectivores such as Nuthatches, Treecreepers and sometimes Woodpeckers.

Blue Tit in Wych Elm – leaves still covered with greenfly

The formation of mixed-species flocks is thought to benefit individuals by reducing the risk of predation; the more pairs of eyes that can spot predators such as Sparrowhawks and raise an alarm the better. On the same principal, it’s likely that their numbers and variety of feeding methods also increases foraging efficiency, the more pairs of eyes seeking insects the greater the chances of finding them. Differing sizes and methods of feeding allows the different species to forage in close proximity without conflict.

 

 

 

 

 

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A Window on the Woods-Winter 1

09 Friday Feb 2018

Posted by theresagreen in bird behaviour, birds of Wales, Nature of Wales, woodland birds

≈ 14 Comments

Tags

Blue tit, coal tit, goldcrest, Great Tit, long-tailed tit, melanism in Blue tit, mixed-species feeding flocks, treecreeper, woodland edge

My kitchen window looks directly onto a short section of the edge of the woodland on one side of Bryn Euryn, my local ‘patch’, that has been the subject of many of my blog posts. Perhaps it’s a bit scruffy-looking, but the good variety of species of trees and shrubby undergrowth offer a habitat that seems to suit a good mix of bird species and gives me the privilege of some close-up everyday bird watching. I have my own personal woodland ‘hide’ with the benefits of central heating and tea-making facilities within arm’s length. I’ve seen a wonderful array of birds on a fairly regular basis this winter thanks in part to their endless quest for food, with the added bonuses of clearer, longer sightings and have had the chance to gain fascinating insights into their habits and behaviour first-hand.

Mixed species feeding flocks

Mixed-species flocks, or ‘feeding parties’ of small birds roam the woods and we seem to be one of the regular re-fuelling spots for at least some of them. Flock sizes and the numbers and the different species of birds travelling within them varies, but their core elements are invariably Blue tits. Usually at the forefront they are first to the feeders, with no hanging back.

Blue Tit – Parus caeruleus

Blue tits are by far the most numerous visitors to the bird feeders. Most mornings they are the first birds I see and also the last in the late afternoon when it’s almost dark. Their numbers vary at different times of the day according to which of the roaming tribes they are allied to.

Blue tit - Parus caeruleus
Blue tit – Parus caeruleus
171204-BEDC-1348-Blue tit

At first glance one Blue tit appears much like another, but with regular watching and focussing in closely to take a lot of photographs, I know that although there is a ‘blue print’ for the perfect bird, (Blue tit print?), there are a lot of individuals about that deviate from the norm. A surprising number are affected by melanism or leucism (more dark or white feathers than the norm) in varying degrees which has helped me recognise individuals. A couple have leg rings, one of which looks ‘normal’, while the other has a band of darker feathers above its beak. A selection of some of those I see regularly enough to recognise on sight now are shown below:

Blue tit with white in crown & freckled face
Blue tit with white in crown & freckled face
Blue tit with white 'nostrils' above beak
Blue tit with white ‘nostrils’ above beak
Blue tit with dark feathers on right side
Blue tit with dark feathers on right side
Blue tit with dark 'frown' above bill
Blue tit with dark ‘frown’ above bill
'Normal' Blue tit with leg-ring
‘Normal’ Blue tit with leg-ring
Blue tit with severe feather problem
Blue tit with severe feather problem

It seems that several of the distinct ones arrive together, so I imagine that may mean they are related. When I finally get around to collating my photographs I’m hoping it will show which families or flocks they belong to or travel with.

Great Tit-Parus major

There are a good number of Great tits too; occasionally appearing alone they are more often in twos or in small family groups. Sometimes there are as many as 6-8 at any one time in a party with other tits. There’s quite a bit of variation in their appearances too, mostly regarding the extent of the dark stripe down their breasts and continuing underparts. One or two are so heavily marked with black it makes them instantly recognisable, another has something odd about one of its eyes.

Great Tit – Parus major

171207-BEDC-1457-Gt tit
171204-BEDC-1249-Great tit 2
171210-BEDC-1439a-Gt tit - dk & scruffy
171222-0828a-Great tit
180103-BEDC-Great tit
171209-BEDC-1122-Gt tit v heavy marks 1

Coal Tit-Parus ater

There are a small number of Coal tits; I’d say I might be seeing four at the most. Their visits are less predictable; sometimes one will appear on its own, most often one arrives together with a party of other tits and occasionally they have been here all together.

The smallest of our British breeding tits, Coal tits behave quite differently to other tits. Initially they’re not quite as bold in approaching feeders and then once food is taken they take it a distance away to eat it.

Coal tit-Parus ater
Coal tit-Parus ater
180112-BEDC-Coal tit 2

A couple of times I’ve been amused by one individual who rather than come forth and take his own food innocently approached blue tits with food, sat close by them, then dashed in and snatched their meal from their claws! The photographs below are of the tiny thief.

Coal tit with Blue tit

Coal tit approaching blue tit with intent to rob

Coal tit snatching food from Blue tit

Long-tailed Tit-Aegithalos caudatus

Then there are the delightful fairy-like Long-tailed tits, they arrive in a small family group most often following behind the rest of the mixed party they have allied to. Oddly though there is one that travels alone but in the company of a party of Blue & Great tits and a Coal Tit. It’s very unusual to see a Long-tailed tit alone, so I can’t begin to guess why this one is, unless it is the only surviving member of a family?

The Long-tailed tits mostly stay slightly higher up than their travelling companions, foraging amongst the tree branches while the others visit the feeders, but occasionally they give me a treat and come closer.

180107-BEDC-Long-tailed tit
180117-BEDC- Long-tailed tit 4

Goldcrest-Regulus regulus

Goldcrest-Regulus regulus

I see Goldcrests around and about fairly often, more particularly from my front window where they favour the big conifer trees. On a few occasions though  I’ve spotted them travelling along with mixed flocks too. They don’t often make their way down as far as their companions that are here for the food on offer, preferring to forage for themselves in the evergreen shrubs such as holly and laurel. I’ve had  some lovely views of them, but taking good photographs of these flitting flickering little birds is tricky, so I’ve resorted to one I took in the right place but back in November 2017.

Treecreeper-Certhia familiaris

Treecreepers are the final regular members of our travelling mixed flocks but from my kitchen window vantage point I have seen one only once. It wasn’t a particularly good close sighting, but I did manage to get a photo of it arriving at the same time as one of the flocks, although it stopped at one of the trees further up the slope.

 

 

 

 

 

 

 

 

 

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