Aural Amble at Wraysbury Lakes

Indian Summer days are delightful, but often not terribly rich in visible wildlife – this year’s young have fledged and left the nest; flowers have faded and gone into fruit (which can be beautiful, of course); butterflies and dragonflies have mostly stopped flying; summer birds have left for Africa; and the warm calm air doesn’t bring winter migrants from the frozen North.

But there was plenty to listen to this morning.

As I walked in off the road, a Heron took off behind the bushes, and gave a two-tone ‘cronk’ note as it flapped off over the lake. I peered through a gap, and there it was, its amazingly broad angled wings like an ingeniously light balsa wood and doped muslin flying machine, totally unlike the awkward folded umbrella of an ungainly bird that a Heron is when perched.

Two Mute Swans took off and flew low over the water right in front of me, as silent as their name: only their wings whistling with each heavy wingbeat.

A solitary Cormorant took off from the water, very black without the white breeding season thigh patches, also silent except for the heavy thwack of its feet slapping the water on the first ten wingbeats.

A Cetti’s Warbler, invisible in the waterside bushes as always, burst into its loud rude song. (Once you’ve read Barnes’s description of just how rude that is, in How to Be a Bad Birdwatcher, you’ll never hear a Cetti’s without smiling again, I promise.)

A Green Woodpecker gave its cheerful triple signature call, somewhere far out of sight. No need to look.

A few Long-Tailed Tits called anxiously to each other, ‘Tsirrup’, high in the willows. I couldn’t see them either, and again, I didn’t mind a bit.

Bizarrely (and this was a sight to behold, perhaps the only one of the walk), 4 Cormorants took to the air, seeming to be chasing 4 young Herons, presumably a family party.

Up on the horses’ hill, a Kestrel hovered silently on whirring wings.

The horses won’t be there much longer: Affinity Water have put up little notices To Whom It May Concern, saying they’ve had enough with ‘flygrazing’ (makes a change from flytipping, presumably) and will remove the horses if they’re not taken away. I suppose the gypsies have left them to breed as well as graze for free (there’s plenty of grass); the horses are always gentle, and do a good job of controlling the meadow, actually. Why would they do that, a friend wondered. I suggested that it made perfect sense – each year, the ‘owners’ could drop in, take a mare, and leave the others to keep up the supply of new horses. What an economical, ecological system. Without the horses, I guess someone will have to pay for mowing, or maybe they’ll hire a flock of sheep for a few weeks each year? Not sure the horses aren’t a better solution. Of course they could leave some goats to go feral. (Only kidding.)

 

 

 

 

 

 

Ivy Bee, a new record for Chiswick!

Ivy Bee, Colletes hederae
Ivy Bee, Colletes hederae: female on the spoil she’s dug from her burrow (top) on the steep bank trodden bare by the reserve’s young foxes

It’s not every day a new species turns up, but here’s one. The Ivy Bee, Colletes hederae, was only described in 1993. It’s a European plasterer bee that likes warm dry sandy soil, and provisions its nest with Ivy pollen (Hedera, if you didn’t get it). The eggs hatch into larvae, which eat the pollen and overwinter in the burrow. The adults emerge the following September; the females dig burrows and energetically collect the pollen which is only available then, while the males laze about, fight, grab females and mate, boast about the women they’ve laid, and drive fast cars. Well, I lied about the last two items, obviously. In 2001 the species arrived in Dorset, and it has since spread across southern England, for instance finding good sandy sites in Oxfordshire. Now in 2016 it has come to Chiswick.

We’re happy to report that the bare sandy ground on the steep south-facing bank has turned out to be ideal for this rather special bee. The young foxes seem to lark about and run up and down the bank every morning, which keeps the vegetation very low with plenty of bare soil. This is just what mason and plasterer bees like, and the ground is full of nest holes.

My thanks to Mick Massie for bringing this species to my attention.

Hammer up
Hammer up
Hammer down
Hammer down

While we weren’t being diverted to photograph the Ivy Bee, we spent the day sorting out the low fence along the ramp path. Here’s Netty and the team whacking a post. I did quite a lot of digging and a fair bit of sawing.

Digging a post hole
Too narrow and deep to use a spade