Conwy

Had a lovely visit to RSPB Conwy this afternoon, and got some photos of a few duck, using the new lens. 

Leybourne at last!

There were a few Common Gulls, Larus canus, on the Ocean, including this one on a buoy at the far end:

Reculver in a Force Five

Great sight of the Dark-bellied Brents flying past out to sea, they are such wonderful animals.

The second bird here MIGHT be a first year, just getting a white v-shaped collar, but still (maybe) with the whitish barring on the flanks. 

Here is a link to an excellent video of a juvenile bird, taken in October 2011, before the white collar develops in mid winter. The white edges to the greater coverts seem very visible, and the generally browner tinges to the dark upper parts. https://www.youtube.com/watch?v=KhILLrcXo_w

A slightly warmer Leybourne

A lovely, still slightly sunny, and only moderately cold afternoon as I arrived, but the light and brightness went after about 3:30, leaving the underlying greyness.

There were Mallard in the small stream downstream of the bridge on the other side of the feeding area, possibly with some hybridisation - the body plumage is way off typical!

The same drake is now on the left, pointing right, and a completely different hybrid is centre top, with totally different plumage, and a female to the right.

The new hybrid flaps vigorously, perhaps to show off to the female, his irridescence picking up the sun!

Here is yet a third hybrid drake, with a brown "unsleeked" head.

Plenty of Black-headed Gulls, Coots, some Moorhens, Mute Swans, Mallard and various hybrid ducks, one Muscovy Duck but unusually no Greylag Geese (that I saw) were at the feeding area. Further along a Little Grebe whiffled across the North End of the Ocean, where there were a pair of Great Crested Grebe, with newly developing crests.

There were some Herring Gulls of different ages mixed in with the Black-headed Gulls, Coots and Tufted Ducks across the Ocean. These are first winter or (more likely I think from the light colours of the wings and back, and the relative lack of black on the beak) second winter birds.

And here is an adult on a fairly distant yellow buoy against the sun.

This is first winter Black-headed Gull, on the bright yellow buoy. Brown primaries and coverts have persisted since fledging, orange beaks and legs, and a dark bar near the end of the tail.

A Great Tit sang from the willows at the start of the channel path. Further along two Canada Geese were in the channel, with a moorhen very close by. The goose on the right is probably a first year bird with the duller colours on the head. The patterns on the flanks may be different as well.

Two or three Herring Gulls were in amongst the Black-headed Gulls on Larkfield Lake. Some of the Black-headed Gulls (at least the three in this photo) were "washing their wings" it appeared. I've not noticed this behaviour before.

and then they dipped their heads in:

I got some record shots of Tufted Ducks here as well.

including one looking as though it was still in moult - a Juvenile bird perhaps?

A Song Thrush scuttled across the Marsh, together with several Blackbirds. As I turned back I flushed a pair of Mallard from the Marsh stream.

The Long-tailed Tits, and one Blue Tit were in the Alders as I skirted the North end of the Ocean on my return journey. Blackbirds were also regularly flushed, giving their alarm calls as the flew off.

A Cormorant flew over. There was one Great Crested Grebe by the feeding area, diving for weed I think. 

Frosty grey Leybourne

A pair of Shoveller on the Northwestern corner of Roaden Island Lake 

Icy Reculver and a Short-eared Owl

Definitely a frigid day at Reculver at the end of the afternoon (I only got back to the car just after 5 pm, proper dark), with a bit of a go with the 500 mm lens and the EOS350. Both Monty and I hoping to get back to our longer walks from now on - but will I get the marking done if I lose my marking focus??

A Short-eared Owl, Asio flammeus, flushed across the oyster marsh channels, was beautiful, very long-winged and ghostly. I saw the large pale grey-brown bird, with very long wings in comparison with its body, floating over the channels and banks,  Maybe the second bird I have seen, I remember seeing Short-eared (I think) Owls with Phil down at Rye Harbour, many years ago.

In the first picture you can easily see the pale belly and underside behind the dark "head" region, one of the main characters that separates Short-eared from Long-eared (description applies to the nominate Eurasian race). Long-eared Owls have a dark belly, that continues on from the head, and contrasts clearly with the pale underside of the wings. There is also a hint of the possible yellow rather than orange eyes, but this is the one character that in the end I couldn't be at all sure of. In this picture the light caught the colour of the bird, turning it a warm biscuit colour.

In this next photo the colour is much less picked up by the last of the evening light. The barring of the tail is seen very clearly, and although this feature is found in both Short-eared and Long-eared Owls, it is more distinct in Short-Eared, as I think can be seen here. In this photo the dark tips to the wings are more or less as clear as the carpal marks, which should be right for Short-eared. In Long-eared the carpal marks are very clear and far more obvious than the wing-tips, which are also fairly clearly barred in Long-Eared, rather than dark-tipped, so to say.

The other thing you can see is the white trailing edge to the wing, which is another of the clear characters separating the two species. Also Long-tailed would be rare, although not impossible sight!

The distribution of the species is fairly world-wide, including Eurasia, North Africa, North and South America, various Caribbean Islands and even the Falklands and the Hawaiian Islands. Its apparently quite a wanderer, one of the most widely distributed birds in the world, although it hasn't reached Australia! It is Least Concern worldwide.

We don't really know how Short-eared Owls are doing as a breeding bird in the UK, but from BTO surveys there are thought to be maybe quite a few hundred or perhaps a few thousand pairs in Scotland and other areas where there is mixed moorland or young forestry plantations. Latest figures suggest about 600 - 2000 pairs. In Europe most observers seem to think that numbers are well down on previous decades and it is graded as Amber status. However it is a very difficult bird to estimate populations of, and there is a lot of uncertainty about the counts. This uncertainty is compounded by its very variable and irruptive population status, apparently very dependent upon vole numbers.

The migratory tendency may be linked to the population size in any particular year. Movements of up to 2000 km have been recorded, but UK birds are less migratory than their continental cousins.

The highest densities are found in areas of mixed rough grasslands and heather moors (marginal hill ground or ‘white moor’). A typical home range is around 200 hectares (~300 football pitches) and it seems that a variety of grassland types and heights within range is beneficial. However, territory sizes vary considerably, ranging from 40 to 875 hectares. Resident owls will defend winter territories of about 6 hectares. Winter communal roosts, occasionally of many birds, may occur.

Young conifer plantations can also be important habitats, though second and later rotation plantings may be less frequently used. (did this cause the apparent increase through to the 70s and subsequent decline? Lowland rough grassland, marshes and coastal sand dunes are also sometimes used for breeding though their use of these areas can be erratic (except on some of the western islands and Orkney). In Norfolk they tend to focus on Brown Rats. European birds use more agricultural habitats, and probably prey upon a different range of mammals.

Sexual maturity is attained within one year. It is a generally monogamous bird, with the males hovering and then swooping down (sky-dancing), perhaps wing-clapping, in front of a female in a courtship dance. Because it is a nomadic bird, site and mate fidelity from one year to another is likely to be low. Courtship may begin as early as February, but is later in higher latitudes.

The nest is on the ground, lined and camouflaged, with normally about 5 - 7(12) eggs. This makes the species unusual, as most owls nest up in trees, and generally do not make their own nests, taking over the nests made by others. Normally the females incubate, and are fed by the males. Chicks scatter from the nest 12-17 days after hatching to hide in the undergrowth, but cannot fly until 25 days or older. There is one brood a year (although replacement clutches are laid following predation) and the young fledge after about 4 weeks in total.

Hunting is mainly at night but often seen during the evening and the rest of the day, often low looking for voles and other small mammals. In the UK typical prey could be predominantly short-tailed vole, but these are absent on Orkney, so there the SEOs have adapted to eating the Common Vole. They will also predate upon birds, particularly waders and gulls/terns by the coast, passerines inland.

Using radio-telemetry, short-term cycles of activity, with a period of about 3 h, were detected in Orkney voles Microtus arvalis orcadensis and in one short-eared owl Asio flammeus, their principal predator. Visual observations showed that owls from four adjacent nests had similar activity patterns. These cycles tended to be synchronous both within and between the two species. Short-eared owls thus appeared to be foraging optimally by timing their hunting to coincide with peaks in vole activity, i.e. at times of maximum potential yield. The extent of diurnal activity in short-eared owls varied seasonally. Daytime activity was conspicuous for only a short period in spring and early summer. Otherwise owls were almost exclusively nocturnal. These seasonal changes in activity were probably a response to variations in vole diurnality, vole population size and daylength. Harassment and kleptoparasitism may have been additional influences that interacted with these seasonal factors to determine the extent of preferred nocturnal hunting. In addition, it is possible that the energetic constraints of breeding may force owls to hunt during daylight. Were males only to hunt at night then they may not be able to provide enough food for their mate and young at a time when nights are short and vole populations are only starting to increase.

They tend to be silent on the wintering grounds, but with occassional scratchy barking calls during the breeding season.

There are some wonderful videos on the BBC site, http://www.bbc.co.uk/nature/life/Short-eared_Owl#p0039c4y

There were a lot of Black-headed Gulls and Herring Gulls on the beach, exploring the wide sand exposed by the low tide.

Cormorants overflew regularly:

Barden Lake at Haysden

A quick 30 minutes down at Barden Lake with the new lens, but only the old EOS 350D camera, as the 7D is in for cleaning and repair - hopefully! The short session was very enjoyable, but also very cold without my coat! 

This is an adult bird, with the head hood just starting to appear I think, looking good in reasonable afternoon light! The primaries show the white tips on the primaries quite clearly.

This is another adult bird, but in this case there is rather less evidence of the hood appearing. Also there are fewer signs of the white tips to the primary flight feathers.

This next one's hood has also not started yet. We are back with rather more obviously white-tipped primaries again.

This is another bird I reckon. The white eyelids are quite visible against the dark of the head, and overall it looks very like the bird at the top of the page:

The next photograph is of a first winter bird. There is quite a lot of wear on the secondaries (?), which are badly (slightly white) "fringed" at the margins. There is a lot of brown in this bird's wings, this is fairly standard where none of the wing feathers have been replaced. The primaries, which have also been around since the bird first fledged last summer, look to be a uniform brown, with no white tips, which may have worn away! The beak (and legs) are generally (as in this picture) orange rather than red, as is characteristic for these young birds.

This is still the same bird taking off. I do like the water drops!

A nice probably female adult Herring Gull, Larus argentatus argenteus on the signpost in the lake.