Feeling a bit broody

With winter loosening its grip on the British countryside our bird life is starting to look forward to spring! Here at BTO HQ, we are winding up to a busy nesting season and are searching the hedgerows and bushes for nests.


Egyptian Geese - photo by Rachael Barber

So far this year we have found nests of Coot, Egyptian Geese, Mallard, Robin, Blackbird, Song Thrush, Long-tailed Tit, Wren, Collared Dove and Dunnock, with more species being added every day. Each nest will be fully recorded for the BTO Nest Record Scheme (NRS) with nest finders following the NRS code of conduct.


Mallard nest with nine eggs - photo by Lee Barber

Robin nest - photo by Rachael Barber

Several BTO staff and volunteers record nests around Thetford, Norfolk, but how do we avoid recording the same nest? The answer is that we share a Google Map between us, with colours and shapes used to denote the progress of each nest and a note included of who found the nest. After a day of 'nesting' we update the map with our exciting discoveries and this informs everyone of where the nest is, the species, when it was found and at what stage the nest is at (nest only, nest with eggs, chicks, not active). Each recorder will then follow 'their' nests and submit them to the BTO (usually via the ringing group) at the end of the season/nest completion.



Last years nest locations on a shared Google map

Across the country there are some species that have been nesting for some time already including Grey Heron, Raven, Dipper, Stock Dove, Cormorant and Crossbill. The BTO NRS Forum has come alive with reports of nests, includes a Peregrine laying in Woking, Surrey (webcam link), a Woodpigeon squab about two weeks old in North Cornwall and Moorhen, Mistle Thrush and Ring-necked Parakeet with eggs in London. Dippers have full clutches in the Scottish Borders and some chicks have already been ringed in Wales. A Stock Dove in North Norfolk must have fledged by now as well.


 

Blackbird nest - photo by Lee Barber

Nest recording is vital to our understanding of productivity and every nest counts! It is amazing how much difference one nest record can make. By looking at the NRS submission totals, you can see what nests have been recorded previously (2016 records are still being analysed). In 2015, just 24 Goldcrest, 15 Snipe and nine Grasshopper Warbler were recorded in the whole country. Take that down to the county level and you could make a big difference to the totals, especially if you focus on one particular species. Open nesting birds are particularly under recorded because they are generally harder to find, but with a little practice and patience it can be done. Click here to find out how to take part and develop your nesting skills.

Nunnery nesting in 2014: off the mark!

We’re fast approaching the time of year where I grab my trusty nesting stick, Carl Barimore reaches for his mirror on a pole and Mike Toms straps on his endoscope as we head down to The Nunnery reserve to start looking for nests to monitor. We generally begin searching in late February, when the Long-tailed Tits begin to pair up and hang suspiciously around likely nesting sites (here typically gorse or bramble) and the first grebes, Mute Swan and Coot start gathering material. However, we’re always on the lookout for opportunities before that, and one was provided on the 15^th January by our colleague, Neil Calbrade, who spotted a sitting Collared Dove in the Nunnery garden, the nest wedged between the branches of a  yew about 3m off the ground. This morning was the first chance I had to check it and the bird flew on my approach to reveal a single white egg; the ‘standard’ clutch size is two, but clutch sizes of early attempts made by multi-brooded species are often smaller (single-brooded species show the opposite pattern).

The typical view of a Collared Dove nest is the underside of a twiggy platform, several metres off the ground in a tree or shrub. It is almost always possible to see the adult sitting from the ground. Photo by  B Besley

It may be tempting to blame the unseasonably warm weather for this apparently early attempt, but Collared Dove is actually the only species in the BTO Nest Record Scheme (NRS) dataset that has been recorded as breeding in every month of the year (Fig 1), although if as many recorders focused on Mallard, it may well reveal the same pattern.

Number of NRS Collared Dove records for which an accurate laying date can be calculated by month in which first egg was laid

That said, fewer than 30 January attempts are logged in the NRS database, dating back to the mid-1960s, and this is the fifth nesting Collared Dove nest we’ve been informed of in the past fortnight (the third in Thetford alone), which suggests they may have made an early start.  It is impossible to compare years without first collecting the data, however; analyses are orders of magnitude more powerful than anecdote when it comes to influencing Government policy on climate change, so it is vital your records are submitted to a national nest-recording scheme.

So, why not make 2014 the year that you register with the Nest Record Scheme and get involved in nest recording – it’s great fun, you’ll learn a huge amount about the birds around you and, vitally, it provides information to support conservation efforts that can’t be gathered any other way.

Information about any species, no matter how common, in any habitat, be it your garden or a remote island, are of value as long as you can see inside to count the eggs and chicks. Looking in nests is perfectly legal as long as you don’t handle the contents, although a licence is need to monitor nests of Schedule 1 species and be sure to follow the NRS Code of Conduct

We’ll be monitoring the progress of our Collared Dove and about 400 other nests across The Nunnery over the course of this season, from Wrens to Mute Swans; we’ll keep you posted on our progress and we look forward to hearing about yours.

Dave Leech, Head of the Nest Record Scheme

http://www.bto.org/sites/default/files/u15/downloads/publications/legislation_and_good_practice.pdf

How do you like your eggs? Frozen

The start of each year sees some pretty intense competition between BTO staff – who will be first to see a rarity on the Nunnery Lakes (generally Nick Moran), who will have the highest list at the end of January (Nick, again), who will catch the most Siskins (Allison Kew, with Greg Conway or Graham Austin a close second), etc, etc. From my point of view, the greatest accolade is the first active nest found of the year and it’s fair to say that I’m usually in the running, poking about in gorse from the end of February for nascent Long-tailed Tit nests or scouring the rivers and reedbeds for early Mallard and Moorhen clutches. The ideal target species would be Crossbill, our earliest breeding songbird, were it not for the fact that to nests right at the top of tall pine trees and I don’t exactly have the best head for heights (or the physique for climbing, these days).

Spot the nest

This year, however, I have been kicked into touch by BTO Press Officer Paul Stancliffe, who located the first Thetford nest of 2013 before I’ve even started looking. On 19th January, amidst the snow covered wastelands of the town centre, Paul spotted a Collared Dove sitting on a nest lodged at the top of a telegraph pole. The bird was still sitting the next day, and on the 22nd he was able to see into the uncovered nest from his upstairs bedroom window, glimpsing the top of at least one egg. It is now the 24th and the bird is still incubating in the sub-zero temperatures.

First nest record of the year for Thetford

Collared Doves are extremely opportunistic breeders. Data from the Nest Record Scheme show that nesting has been recorded in all months of the year (sample size c. 4,200 records). The peak month in terms of clutch initiation (the laying of the first egg) is April (Figure 1), and the main season is typically from March to July. This is earlier than Woodpigeon which again can be found nesting in most months, but exhibits a peak in laying between July and September.

Figure 1

The current cold snap doesn’t really seem to present much of an opportunity, however, and I fear that the outcome of this attempt is unlikely to be positive. We shall continue monitoring their progress to find out.

Dave Leech