Wednesday, 20 January 2021

Bird ringing under Covid-19 - November 2020

In a month almost totally affected by covid lockdown 2, we were fortunate to manage a session at Chobham just before it started, and another under lockdown restrictions at the month-end.

48 birds of 5 species were ringed with Lesser Redpoll leading on 37. A colour-ringed male Black-headed Gull turned up on the Thames at Windsor having been ringed in Denmark, 980km away in 2015.

Nocturnal-migration recordings picked up twenty-four species over Ealing including 1,737 Redwing,  81 Song Thrush, 9 Fieldfare, Teal, Wigeon, Lapwing, Turnstone, Golden Plover, Moorhen, Coot and Skylark. We recommend everyone try this in their own gardens to see what it passing, unseen, overhead!


Black-headed Gull movement København, Denmark to Windsor

Bird ringing under Covid-19 - October 2020

Two sessions were possible at Chobham and these contributed the majority of the 245 birds ringed in October. 131 Lesser Redpoll kept ringers busy but 3 Crossbills stole the show. Redwing at 32 just beat Meadow Pipit on 31 but 3 Stonechat and 2 Blackcap were nice additions.

Some recoveries from the redpoll catch suggest origins to the west and north-west and a rapid onward movement eastwards.
Crossbill young male (Carl Hunter-Roach)
Male Crossbills (Carl Hunter-Roach)

Bird ringing under Covid-19 - September 2020

A good month produced 1,047 new birds of 26 species from 5 sites, with the intensive work at Wraysbury providing 957 from five sessions. Tythebarn's 192 from 8 sessions; Bedfont 148 from 4 sessions and even 50 from the Heston garden.

As expected, Blackcap was top species at 418 followed by Chiffchaff at 180 but Blue Tit at 115 was just ahead of 96 Meadow Pipit. Against this, Sedge, Reed, Lesser Whitethroat, Whitethroat, Garden and Willow Warbler had mostly moved on whilst Goldcrest and a Firecrest (see below) arrived at Bedfont.

Noc-mig recorded Redwing and Song Thrush, Siskin and Redpoll at Ealing.


Firecrest at Bedfont (Eleanor Page)


Monday, 28 September 2020

Bird ringing under Covid-19 - August 2020

Although the East coast experienced north-east winds bringing good falls of migrants, only Pied Flycatcher seemed to penetrate inland with 30-40 reported near our area up to 18th. Unfortunately, this was a period when we could not cover Wraysbury, the most likely site for this species to turn up.

189 new birds of 21 species were ringed, mostly at Bedfont. Top species was Blackcap (39) just beating Reed Warbler (36) and well clear of Blue Tit (25). Nice records were of a Kingfisher and two more pulli Common Terns, plus the return of House Sparrow to the Heston garden.

A six-year old Robin extended the Group longevity record by six days. 

Bird ringing under Covid-19 - July 2020

A busier month with 167 new birds of 21 species. Reed Warbler and Blackcap led the field with 30 each with Chiffchaff third at 20.

Some sightings of colour-ringed Common Terns were received including three young from this year.

Being able to identify a bird's hatching year is very useful for measuring the productivity of a species (and species on a specific site). Below, are examples of criteria we use for Sedge Warbler and Whitethroat.

Sedge Warbler
compare primary wear between two ages (youngest: left; adult: right)

Whitethroat
compare eye colour between two ages (youngest: left; adult: right)

Bird ringing under Covid-19 - June 2020

Some ringing sessions were possible this month and new working methods tested, adhering to social distancing rules.

120 birds were processed, mostly at Wraysbury and Windsor garden, and 33 pulli Common Terns were marked at Bedfont.

After these, Chiffchaffs were top species at 16, with Bullfinch, Lesser Whitethroat, Reed Bunting and Treecreeper giving variety.


Tawny Owl at Tythebarns Farm, Surrey (Andrew Kingston)


Bird ringing & "noc-migging" under Covid-19 - May 2020

In the second month of lockdown only household-run garden ringing was possible following BTO guidelines.

Our Windsor ringer began a trial of the Garden CES and some boxlings were possible too. 85 birds were ringed of 10 species including 30 pulli. 27 House Sparrows indicate a healthy population around Thorpe Lea Road


Male House Sparrow

Our Ealing member used his ‘Noc-mig’ to identify the birds flying over his garden. Here's his account:

The ‘Noc-mig’ was used nightly from 1st -15th. However, the number and diversity of birds slowed right down and effort was reduced to setting the recorder to about every other day for the remainder of the month. During the month there were records of Common Sandpiper (1st), Moorhen on 5 dates (including two together on the 5th), Coot (5th and 11th) and a probable Whimbrel on the 12th.

For those thinked in ‘Noc-migging’ the picture below shows my very basic set up. I put the kit out on a chair in the back garden so it is raised up from the attention of prying foxes and other creatures of the night.

I also have an external hard drive to save files onto – each 3hr file takes up about 2Gb so will quickly fill up your computer’s hard drive otherwise.



An excellent place to start learning about Noc-mig, setting up, what to record and analysing files can be found at www.nocmig.com.

Other useful resources are https://www.xeno-canto.org/collection/area/europe (for comparing others’ spectrograms) and https://birdnet.cornell.edu/api/ where you can upload your audio files and it will give you a probability of which species it is.

Away from Noc-migging, not much was recorded in/over the garden during the month, though the first local Swifts returned on the 5th and one or more Swallow were ‘heard-only’ heading north mid-month.