Swifts were still around on 26th August despite the major departure from the City a month earlier on 28th/29th July. Fifty high over the City, 15 over the Senate House on 15th August and 10 over Histon Road on 17th August perhaps signalled another local departure. On 26th August two over Trumpington Street and one over the Market Square were probably feeding late broods.
A Wren was feeding young in Logan’s Meadow on 2nd August and Painted Ladies were the commonest butterflies on the Buddleia at Cambridge North Station on 19th August. The Painted Ladies looked in good condition, not ragged migrants, suggesting they had hatched locally. The invasion of Painted Ladies this year has been remarkable. In mid-July, I visited the Malin Head, the most northerly point in the Republic of Ireland, and there was a Painted Lady every 25m.
The Willow Emerald Damselfly (above) is a species new to our study area. I think Duncan McKay discovered it first. Nationally it is expanding its range and the one photographed by Trevor Kerridge at Milton Country Park – just within our NatHistCam study area – is a new location.
I haven’t seen a Spotted Flycatcher in the City for many years. They used to breed in Whitehouse Lane off Huntingdon Road but when the Elms went so did the flycatchers. There is an excellent article in the latest bulletin (covering June/July observations) of the Cambridgeshire Bird Club by Mike Holdsworth about a three-year study into the distribution of Spotted Flycatchers in the County which have declined dramatically. The College Gardens and the Botanic Gardens look ideal habitats but none have been found in the City.
Keep an eye open for Common Cranes in flight over the City – Jon Heath has seen them. This time of year they gather in numbers and move around the countryside. The Fenland population in 2018 was 53 individuals and is now the largest in the Country and exceeds the North Norfolk population and the reintroduced population in Somerset. I recently visited The Wildfowl and Wetland Trust reserve at Welney and saw a group of 26 – disappointingly they were all adults with no young birds from the current breeding season.
A recent article in British Birds magazine by Mark Avery describes how forty-three million non-native young Pheasants are released for shoots annually. He questions the impact this might have on local wild bird populations (British Birds, July 2019). Only about 13 million of these are actually shot! This may account for the increase in Buzzards which must be our commonest countryside raptor and probably breeds in our study area. There have even been calls from the shooters to cull Buzzards that are taking some of these released birds or scaring the released game birds onto non shooting land. Most pheasant shooting is carried out with lead shot so there is a knock-on pollution problem. In Denmark lead shot is banned and replaced by steel shot.
A Willow Warbler (above) was in the Buddleia at Cambridge North Station on 19th August. I used to think I could tell Willow Warbler and Chiffchaff apart on their calls. Willow Warblers have a disyllabic “hoo …weet”, Chiffs a monosyllabic “hooeet”. I’m not so sure now! At least two Chiffs in Milton Country Park on 15th August, two Chiffs in Logan’s Meadow on 23rd August were typical tail and wing flicking Chiffchaffs; one heard calling in a private garden in Huntingdon Road on 29th August (identified by call!).
There have been several county records of Pied Flycatchers in the last two weeks of August and lots along the Norfolk and Suffolk coasts but none revealed themselves in our study area.
There have also been county reports of Whinchats and Redstarts. Whinchats used to be regular autumn migrants on a farm in the north of our study when I worked there.
An Osprey was seen at Great Kneighton/Hobson’s Park on 26th August – a typical date for this migrant. One of the adult Peregrines was seen near its City centre nest site on 29th August.
Bob Jarman 29th August 2019