My recent visits to Potwells in North Mymms Park have helped me 're-imagine' birding in Herts and begin to believe that good birds might be found, more regularly...if we look!  The temptation is always to look and travel outside Herts for the best birding, or just to wait for others to turn something up, but I think the best rewards come from doing the legwork and discovering some local birds.

My decision to regularly 'do vismig' or observe visible migration from Potwells was long overdue and regular recent visits have rewarded me with a great selection of birds that I just wouldn't normally see in Herts, at least not every year - Goshawk, Tree Pipit, Woodlark & Hawfinch.  Usually I have to wait for a trip to Dunwich Heath in Suffolk or to Wykeham Forest in North Yorkshire but not only have I now seen these birds locally but also more than once!

Today I arrived at 6am - perhaps a bit too early as it was properly dark but I did get several Tawny Owls calling!  For the first hour, even hour and a half, passage was slow to non-existent but eventually Chaffinches and Meadow Pipits began to call and suddenly a Brambling was flying around overhead!

Siskins were plentiful but just after 7.30am I caught a glimpse of a large finch flying up the valley.  Unfortunately it disappeared before I could really confirm what it was but it made me think "Hawfinch".  I played the call and listened and realised I could hear a ticking call - it grew louder and I picked up the 'tseep' flight call too.  I knew it must be perched somewhere on the edge of the wood and, sure enough, there it was, a nice male Hawfinch!  At the same time I thought I could hear another bird but couldn't see it.

Once a Herts speciality, the Hawfinch is now a very rare breeder in Herts and scarce winter visitor.  I don't usually see them every year in Herts and only got to grips with their various calls during the big influx of the winter of 2017/18 when many birds were around in local woods.  It is still a real treat to find a Hawfinch - something I do every year when I visit a known stronghold at Lynford Arboretum in Norfolk - but this was extra special being in woods local to me.

I kept alert and 2 more Hawfinch flew over headed southwest soon after 8am and a further Brambling too.  Despite otherwise low numbers of passage birds the quality had not been lacking.  Swallows and House Martins also continued to make their way south but otherwise the skies were quieter than in previous visits.  I plan to visit again soon - surely Crossbill and Ring Ouzel must be likely potential additions...?

I have resolved - weather & diary permitting - to do a vismig session every weekend first thing at Potwells in North Mymms Park during October.  As a trial run I arrived there this Sunday gone (29th Sep) at 6am just before first light to see how things were shaping up.  The forecast was for some cloud cover and a relatively gentle southeasterly breeze.  As the day dawned the forecast appeared fairly accurate and I witnessed a beautiful sunrise before comprehensive grey cloud got the better of things.

Walking through Redwell Farm from the car to the Potwells viewpoint I could hear one, possibly two, Little Owls calling.  A Skylark also called in the dark - oddly the only one of the morning - while a few Song Thrushes 'ticked' from the surrounding hedgerows.  I arrived at the viewpoint just as the first glow of light was appearing in the east, set-up and began to wait in expectation.

By 7.20am I was beginning to lose heart a little as nothing much seemed to be on the move save for a trickle of Meadow Pipits and the odd Chaffinch.  I did however note a fair few Swallows headed eastwards along with some House Martins.  I reminded myself that birds often don't move until later, depending on conditions so worth the continued wait.

I needn't have worried as, come 7.30am, a sudden increase in passage became apparent with Meadow Pipits, Siskins and Chaffinches moving over in a more definite NE to SW trajectory.  It was at that point I began to hear what might be a Woodlark but blended a bit with the Robin song.  As it drew nearer I could hear the repeated "tit-looee" call as it made its way up the valley and knew I had a Woodlark!  A hasty scan and there it was, heading SW up the valley just above the treetops.

I could easily see its short tail - like a young lark with no tail - and hear its regularly spaced call as it flew in a steady undulating flight past me.  A fantastic record and a Herts rarity although I am convinced we miss many more of them - after all, how many people are daft enough to stand on a hillside in the dark on a Sunday morning?!  It was yet more confirmation that I had found a good 'vismig spot' and that the birds would appear if I was there to look.

The Swallow & House Martin passage continued but shortly after 8.00am another target bird of any vismig session started calling right above me - a Hawfinch!  It disappeared over the tree line and I wondered if it might settle in the woods.  I wasn't able to locate it however but it did become #147 for my Five Miles From Home List - just 3 to go to my target 150!

By the end of my vismig session I'd witnessed over 100 Swallows and 50 House Martins head southeast and just shy of 50 Meadow Pipits and Siskins move mainly southwest.  Other highlights included my first 5 Redwings of the autum, a Hobby, a single Sand Martin and at least 10 Song Thrushes dropping into the hedgerows.