The oldest tree.

old tree

If only trees could talk

This beautiful English oak (Quercus robur) is 650 years old and the oldest tree in Osterley Park. 

Just think of the many global events that have happened during its growth since growing from a sapling in 1364!

With circumferences of Oaks ranging from 4m to 12m, at 6.5 meters, it took a group of 5 people with arms fully stretched to encompass this tree! 

Carla Malcolm (Assistant Warden) – the smiling female in middle of picture.

Barn owl(s) about

barn owl kish 2

At Osterley we are lucky enough to have a group of enthusiastic birders who report in their sightings. One of the highlights this year has been a barn owl hunting in an area of  rough grassland adjacent to Osterley Park.  One of the group, Kish Woolmore, has been kind enough to let me post some of his fantastic photographs of a barn owl hunting. In one of the photos you can see what is most likely a field vole being grasped by the talons of the owl.  Barn owls used to be the most common species of owl in the U.K, now only about 1.4% of farms are home to barn owls. 

Barn owl kish

Even more batty!

The London bat group brought a group of people to listen to bats at Osterley this year. The group was learning how to use bat detectors. after spending the night listening to the calls and deciphering wich species are present, they deduced that we have Leisler’s bat(sometimes called lesser noctule) in the park. Nationally, this bat is much less common than species such as common pipistrelle, although more abundant around West London. 

A hunt for Nathusius’ pipistrelle in the estate has also confirmed their presence here.  Along with recordings of common pip, soprano pip, daubenton’s, noctule and a record of brown long-eared bat from 1983 we have 7 species at Osterley – not bad for a property 5min from Heathrow!

Nyctalus_leisleriLeisler’s or lesser noctule bat


A walk along the lake edge

Some more observations from Mark Russell.

800px-Bumblebee_October_2007-3aBuff tailed bumble bee. Bombus terrestris.

Dear Jeremy,

I took a walk along the bank of the MiddleLake today. Absolutely wonderful to see what was going on. The stools/snags/rootstocks are regenerating coppice-like. The ash looks, thankfully, disease-free. The elm, now fourth or fifth generation, likewise. And could that be a sweet chestnut I saw as well? I can’t remember seeing a mature one growing at that location. Please advise!

The flowers of water mint encroaching the bank were being visited by red and buff tailed bumbles, cuckoo bees, hoverflies and day-flying beetles of several sorts. Common blue, gatekeeper and wall brown butterflies were there too.

A few blue-tailed and red eyed damsels were still flying. This is the latest calendar date that I have ever observed Zygoptera. No Anisoptera to report today. Very odd!

Today’s highlight for me, however, was the observation of a colony of cinnabar moth larvae devouring the ragwort that has been allowed to grow.



Damsels at Osterley (updated)

Mark Russell is a keen naturalist, supporter of Osterley Park and member of our volunteer birding group. He often sends me his observations which I thought I would share on this blog – thanks Mark!

Hello, Jeremy,
Today was the first time for a month that I’d been able to take a walk round Osterley Park.
I attempted a deliberate, non-bird walk round the lakes. It was good to see Common Blue, Blue Tailed and Red Eyed Damsels still going strong along with two, male, Black Tailed Skimmers on patrol. The water level in the Middle Lake was commendably high which has surely helped emergence along with the sturdy, marginal vegetation which was looking great and attracting and hosting some invertebrates way beyond my powers of identification. I also observed meadow brown, comma, small skipper and green-veined white butterflies along with other day-flying and/or disturbed micromoths.
The best bit though, was when a visitor to OP approached and asked me if I could tell her about the seagull she’d seen flying into the water head-first.
She had seen a tern fishing and as I began to explain, a gathering of other young people who had also seen it became genuinely interested too.
Some non-bird walk! This enthusiasm made my day.

610px-Black-tailed_SkimmerBlack Tailed Skimmer


Hello Jeremy.
Good to see you today.
All three species of previously reported damsels were still flying, some in tandem. It really is a remarkably late season.
One dragon, a Brown Hawker was on patrol over the water near the island on the Middle Lake. Brilliant. This is only the second time in three years that I’ve seen this one at OP so it’s nice to hope that it may be home-grown.
Small Copper butterflies were feeding on the flowers of water mint along with good numbers of the other browns mentioned previously.
The Cinnabars have eaten all the ragwort foliage and only three larvae remain in a hopeless search for food. I hope some of them managed to pupate before they started eating each other, unless of course, these are three, lucky cannibals.
Examining the defoliated host plants, I noticed a solitary, bright yellow looper, about 10mm in length and =>1mm in diameter, around the calyx of one of the flowers. I’m trying to ID it. Any ideas?
brown hawker Brown Hawker

Tufted traveller

tufted duck saddle

National Trust animal ecologist Peter Brash recently picked up on a tufted duck with a nasal saddle on the garden lake at Osterley Park. These saddles are an alternative to ringing and do not harm or bother the ducks. Here is what Peter had to say about this duck. (photo courtesy of nmahieu from flickr taken on the Thames at Fulham).

Hello Jeremy,

I’ve just received the info on the male tufted duck I saw at Osterley on 8th and 9th June.

It was given a nasal saddle (a piece of plastic with number and letter codes) at Braud-et-Saint-Louis, France on 16th April. According to the person who rung it, it was being held illegally captive by hunters. Braud-et-Saint-Louis is a little way north of Bordeaux so the bird flew at least 450 miles to arrive at Osterley.

The bird was rescued from the hunters and given its nasal saddle before being released. I can only presume that the hunters were using it as a live decoy to lure other birds in. Awaiting more detail from the ringer.

Turns out tufted ducks can get as far away as Siberia and Pakistan after being rung in Britain, so 450 miles isn’t very far!



Injured swan rescued


At about mid day on Wed 12th June, a distressed visitor reported to me that we had an injured swan on the far bank of our middle lake edge.  It had landed on the lake at Osterley only to be received by another territorial male. Our resident pair of swans are currently raising four cygnets on this lake and the cob (male swan) took exception to this visitor. After coming very close to being drowned by the large cob, he managed to fight his way free and scramble up the bank of the lake. Unfortunately, one of his wings was smashed during the fight.


Myself and another ranger at Osterley drove around and picked up the injured swan. We are very lucky to have The Swan Sanctuary in our area, so we wasted no time in delivering the swan to them for treatment.


The swan was clearly in distress and not used to being in the passenger seat!


Once we arrived at the swan sanctuary, and member of their staff wasted no time in taking the injured swan in for an examination.


He was very thirsty after his ordeal and was happy to have his smashed wing strapped up and some space on his own.

The final prognosis for this swan was that he will need to have his wing amputated. It is a shame to think that he will be unable to fly again, but thanks to the sanctuary, he will have a 20 acre site with a huge lake full of other convalescing swans where he can swim about in peace for the rest of his days.