Monday, 1 March 2021

Grus grus - streams of Cranes!

It's that time of year again. The past couple of days have seen an impressive eastward migration of Cranes Grus grus over Slovenia. Large flocks of up to 1000 birds entered Slovenia in the west, from the plains of NE Italy, and flowed above the Karst, Vipava valley and the Notranjska region, heading eastwards in the general direction of Hungary. We didn't need to go far to see them - on Saturday (27th Feb) several flocks passed low above our home. The steady northeasterly burja was making migration difficult for the Cranes, which were keeping rather low and were therefore easily visible (and audible). A morning flock of around 130 greeted us when we woke up and walked out of the door, while another one numbering 63 birds said goodbye in the evening (pics below). Other observers to the north of where we live were even luckier with flocks of 200, 400 or even more, while in the Notranjska and over the Ljubljana region single observers counted totals of up to 3000 birds!

The Crane spectacle is getting bigger and bigger every year and an increasing number of people is reporting migrating flocks from all around the country. Sophisticated smartphones and social media in the hands of "ordinary people" surely help a lot in the recording of sightings. At the moment the provisionary tally for Slovenia, according to Dejan Bordjan (who collects all the data about Crane migration in the country) stands at around 30.000 Cranes. But the next days, as stable weather conditions continue, might bring more. Keep your eyes to the skies!

Those of you who would like to delve into the subject should really read this blog by Paul, which analyzes the steep increase in Crane numbers over the last decades in NE Italy (and consequently Slovenia/N Adriatic).

Good spring migration to you all!


Tuesday, 23 February 2021

Flicks of crimson on the cliffs

 
This time just a short post to talk about some interesting inhabitants of limestone cliffs. Last week we made an afternoon visit to the the Karst edge, checking an excellent wintering site of the amazing Wallcreeper Tichodroma muraria. This rare breeding bird is usually difficult to find in the Alps where it often breeds in inaccessible places, while it is much easier to observe in winter at lower elevations around the Karst. As you can see from the pics and video, we were very successful in finding not one, but three different individuals: two were together on the same cliff, while a third was seen a couple of hundred metres away on another limestone wall. The one in the video was particularly showy and we even managed to photograph it alongside a clump of Tommasini's Sandwort Moehringia tommasinii, a rare endemic plant along the Karst edge of Slovenia, NW Croatia and NE Italy. There are only 6 localities where the species grows - isn't that amazing? The plant wasn't in flower unfortunately, but this is how it usually looks in spring.
In the same cliff there was a noisy pair of Peregrines Falco peregrinus being in constant dispute with a pair of Ravens Corvus corax building their nest on a low cliff ledge. We even managed to identify one of the Peregrines as an individual we caught and satellite-tagged in spring 2020, as it still had the small device with antenna attached to its back (and still delivering data to our colleague's PC!). 
There's always something interesting to see on the Karst edge at this time of year, as spring here seems to arrive earlier than elsewhere. It won't be long until the first Alpine Swifts Apus melba & Blue Rock Thrushes Monticola solitarius return...

Wednesday, 17 February 2021

Approaching the end of winter

Blogging has been very slow lately, partly because of work and other commitments and partly because of the season's typical "wildlife emptiness". Field activity has been reduced to a minimum also because of the poor weather, although there were the "usual circuits" we've been still working regularly, including Škocjanski zatok and the Karst around home. However we will begin this post with something more "exotic". Last weekend we descended from the cold and wind-swept Karst and went looking for some early spring signs in the Dragonja valley in Istria (close to the border with Croatia). We visited a nice little tributary of the river Dragonja, with a rather famous waterfall, where Maidenhair Fern Adiantum capillus-veneris grows. In Slovenia this Mediterranean species of fern is scarce and localised to the warmer areas of the Primorska region, where it grows on wet travertine rocks. Istria is the best place to see this interesting plant, although we also have a relict location in the Karst at Škocjanske jame (Škocjan caves), where it grows alongside alpine species such as Bear's Ear Primula auricula. Along the little stream and right under the waterfall we admired good numbers of the fern, although not all the plants have sprouted their fresh stems yet. Given the very low temperatures of the past days, some of the plants were ice-covered - something which is probably not very common to observe in this Mediterranean species. The first tiny blooms of Cornelian Cherry Cornus mas and several Primroses Primula vulgaris cheered us up a bit... but not too much (as true spring is not that near after all). Further downstream along the river Dragonja we came across another rare Mediterranean plant (although very common in Croatia), the Prickly Juniper Juniperus oxycedrus, the red-berried cousin of the more widespread Common Juniper Juniperus communis.

The tributary of the Dragonja, disappearing down a rocky ledge.
The waterfall from below, where a rather deep pool is formed.
The stream plunges down a block of flysch in a quite scenic way.
Maidenhair Fern Adiantum capillus-veneris
Travertine rocks formed with the accumulation of calcium carbonate deposited by water.
Primrose Primula vulgaris
Cornelian Cherry Cornus mas

Prickly Juniper Juniperus oxycedrus

 

Moving downstream the Dragonja valley we decided to take a look at the Sečovlje salinas (saltworks), an area rich with birds that we visit only occasionally. The long walk along the final part of the Dragonja and down to its estuary produced the expected mix of common waterbirds, including lots of Shelducks Tadorna tadorna, several Common Sandpipers Actitis hypoleucos, a Marsh Harrier Circus aeruginosus, singing Water Rail Rallus aquaticus, a Pygmy Cormorant Microcarbo pygmaeus and others. More interesting was the sea where we found a group of 4 Slavonian Grebes Podiceps auritus, a Black-throated Diver Gavia arctica and good numbers of Red-breasted Mergansers Mergus serrator and Black-necked Grebes Podiceps nigricollis - all typical winter visitors in the Adriatic. In the late afternoon we scanned the ruins of the old saltworker's houses and spotted no less than 3 Little Owls Athene noctua. It is always a pleasure to find and observe this rather scarce species in Slovenia, nowadays almost confined to the very western part of the country.

Sečovlje salinas
Three shiny white cheeks...
Slavonian Grebes Podiceps auritus
Black-necked Grebe Podiceps nigricollis
Pygmy Cormorant Microcarbo pygmaeus
Reed Bunting Emberiza schoeniclus
Red-breasted Merganser Mergus serrator
Little Egret Egretta garzetta
Little Owl Athene noctua
Spot the owl.
Birding the saltworks.
Saltworker's houses with the Italian Alps (on the other side of the gulf) in the background.

 

If there's one thing that hardly changes throughout the year (regardless of outside events) and dictates the tempo of the seasons is the regular weekly bird monitoring at Škocjanski zatok. Although waterbird numbers are the highest in winter, this season brings little variety of species and therefore little entertainment. However, in the course of the past month we managed to gather several (locally) interesting sightings. Perhaps best of all was a flock of 298 Lapwings Vanellus vanellus stopping at the wetland during their northward migration, which represented the highest count for this species at the reserve. Hidden among Lapwings were also two Golden Plovers Pluvialis apricaria (a rare species at the reserve). Among all the common dabbling ducks that regularly occur at Škocjanski zatok, the rarest is, inexplicably, the Pintail Anas acuta. We are therefore always happy when we find this species, like we did recently, when a group of 7 was resting in the lagoon. Other interesting/unusual species observed in the past month included Spotted Redshank Tringa erythropus and Fieldfare Turdus pilaris, but for more you should check Škocjanski zatok's FB page (& website) where you can follow the regular updates, with almost-complete check-lists uploaded on a weekly basis. Also, this week the reserve has re-opened to the public after the lockdown, so you're welcome to visit!

Lapwing Vanellus vanellus
Golden Plovers Pluvialis apricaria hiding in the halophytes.
Pintail Anas acuta
Winter wildfowl mix - name the species.
Shoveler Spatula clypeata
Courting Gadwalls Mareca strepera
Curlew Numenius arquata
Penduline Tit Remiz pendulinus

 

To round up the post we'll also mention some of the interesting sightings from our local area in the Karst. Although the landscape is still very much wintry, woodpeckers are beginning to be very active in the woodlands, while also Eagle Owls Bubo bubo have started to advertise their territory on several locations not far from home. Our short wanderings around the Karst have mostly included scouting for new locations (searching for nests, territories ect.) as well as admiring the local hydrogeological features of this extremely interesting area. Smartworking has also enabled us to do some regular office birding, livening up those dark rainy and cold days in front of the pc. A relatively large flock of around 60 Siskins Spinus spinus has been present at our feeders recently, similarly to the Hawfinches we had last year at the end of winter. Sparrowhawks Accipiter nisus also make regular incursions into the garden but only seldom pose well like in the below photos. On calm evenings the first migrant Mute Swans Cygnus olor are visible overhead and will be soon followed by the late winter flow of geese, ducks and Cranes Grus grus moving north to their breeding grounds. Needles to say, we are eagerly waiting to see what the start of the spring season will bring!

Sparrowhawk Accipiter nisus
Siskins Spinus spinus from the bedroom's window.
Lesser Spotted Woodpecker Dryobates minor
Black Woodpecker Dryocopus martius
Great Grey Shrike Lanius excubitor
Mute Swans Cygnus olor migrating low above a Karstic woodland.
Common Jelly Fungus Tremella mesenterica
Yellow-berried Mistletoe Loranthus europaeus
Meletova jama (cave) with waterfall near Ocizla.
We really like water falling into caves!