Tree Pipit NE, calling. Seemed very late but ID confirmed from sound recording
30+ Common Crossbill E
306+ Meadow Pipit, mostly S/SE
46+ Lesser Redpoll, mostly SE
30+ Chaffinch
c300 House Martin SE
28+ Swallow S
4+ Sand Martin SE
Raven
5 Skylark
6+ Greenfinch
10+ Pied Wagtail
10 Mistle Thrush W
3 Mallard S
100s of Siskin - too many to count!
Tuesday 22 September 2020
Jarn Mound vismig 06:35-09:15
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Issac have you read up on David Lack's ground breaking vismig studies in oxon ... some at Boar's Hill: I believe the one you're watching. Though, in those days, watchers tended to stop in September. Lastly, I presume you're checking tree pipit against sonograms? I ask as my friend had OBP at my old pennine vismig site a couple of years ago. Though I think early october. But to human ear OBP and TP can sound similar. His was confirmed by sonogram.
ReplyDeleteHi Mick, no I haven't read up on his vismig studies. I know about his studies on Swifts but was unaware of any studies on vismig. Do you know where I can find them? Yes I am checking the sonograms to confirm identity. OBP had crossed my mind but it seemed fairly early for them to be arriving and this is Oxon of course! I did read up on an article about splitting the two on sonogram of flight call, but initial pointers (low frequency, shape) suggested tripit rather than OBP. Now you mention it, I may take a better look at it in the vague hope of an OBP...
DeleteLack was a vis pioneer. 1940s 50s. Unfortunately his info spread around journals.but some in BB "Bird Migration" maybe Ibis. Try Google lack vismig. Also eric Simms books on migration/cotswold corridor and dollis hill London: and his book suburban birds. All a bit tame but you might like their early studies of flight lines and effects of topography and wind on vismig. Yeah, this is oxon. But Pennines aren't renowned for OBPs either! And a Blythe's Pipt wintered only c10 miles from my old vis site. We can dream
DeleteOK thanks - will have a look around! I'm sure something exciting will turn up at Jarn Mound at some point given that the movement isn't too bad, but maybe not until October I guess (when I'm no longer here...)
DeleteRing ousel with winter thrushes. Hawfinch with redwings! End of message!
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