Articles in ‘Aiguamolls de l’Empordà’

Viperine snake takes on large Water frog (and gives up)

Written by Lucy Brzoska

Walking along a hot, dusty track in the Alt Emporda, a woodchat shrike singing in a nearby tree and bee eaters dipping and diving over the olive groves, we heard a piteous crying sound.   It was coming from the long trough-like irrigation channel at the side of the track: a strongly protesting Iberian water frog (Pelophylax perezi) was in the grip of a Viperine snake (Natrix maura).

viperine  snake (Natrix maura) captures Iberian water frog

The aquatic snake had seized the frog by the leg and was swimming vigorously up and down the channel, the belly of its helpless prisoner flashing white in all the whirling.

viperine snake swims with captive water frog

The non-venomous snake next tried tightly knotting itself around its resistant prey, its mouth still gripping the leg.

viperine snake knots itself around iberian water frog

Suddenly it seemed to tire, released its coils and swam to the side of the channel.  The frog waited a moment, and then tried to swim away.  But its movement immediately triggered a reaction in the snake, which this time seized the amphibian by the back.

viperine snake (Natrix maura) biting iberian water frog (Pelophylax perezi)

Despite the considerable gape of the Viperine, it was clear the frog was too big for it to swallow. Eventually the frog was allowed to make a getaway, but fatally weakened, it didn’t survive the attack.

Aiguamolls de l’Empordà at Easter

Written by Lucy Brzoska

In the intensely developed Empordà plain, the wild and human overlap.  Circling storks and patrolling marsh harriers can be observed at the Aiguamolls nature reserve with a background of skydivers, dropped off in batches by droning planes and helicopters. You cross the Muga, which slides placidly to the sea between wooded banks . . .

river-muga

. . . another step and suddenly Empuriabrava looms into view, a legoland development sprouting at the mouth of the river. Across the plain,  traffic roars on congested roads, and electricity pylons clutter the landscape.  But in a stroke of genius, by fitting perching sites for the storks and nest boxes for the kestrels, the reserve has appropriated the pylons.

storks-and-kestrels-on-pylon-in-the-aiguamolls

The photo was taken near the Vilaüt lake, away from the coast, where the reserve’s first hide was built.  Rising salinity, drought and contamination from fertilizers has affected the quality of the water  in recent years, and some species have stopped breeding there.  Solutions are being found, including expropriation of land.  The view from the hide, looking north west, is pristine.

view-from-vilaut-hide-in-aiguamolls

The path to the Vilaüt hide meanders among rocky outcrops and oaks, in contrast with the water-logged meadows and absolute flatness of the surroundings.  Cows  graze with their retinues of Cattle egrets.  A single Conical orchid (Orchis conica) had emerged on the grass, the flowers like pale strawberry ice cream cupped by leaves. Close up, the petals look like pink bonnets trailing in the current of a stream.

conical-orchid-orchis-conica

conical-orchid-close-up

Corn buntings were present in astonishing density.  The whole area vibrated with their songs, broadcast from every branch and post.

corn-bunting

Four red kites were hunkered down in a tree, resting mid-migration and getting mobbed by a raven. Later that morning I heard a trumpeting directly above me, and saw two cranes circling higher and higher.  After reaching the correct altitude, they stretched their necks due north and disappeared over the mountains.  I wondered if they were the same pair I’d watched taking a bath at the Cortalet the day before.

cranes-resting-in-the-aiguamolls

In the extensive preening session that followed, with much vigorous wing-shaking that at one point seemed would evolve into a dance, the cranes would regularly lengthen their necks in cautious observation.  A cruising marsh harrier set them off trumpeting.

marsh-harrier-patrolling-the-aiguamolls

At the end of March, there was an air of expectation around the Cortalet.  An early flock of Bee eaters flew overhead.  The first nightinglales were still quite tentative and acoustically Cetti’s warblers had few rivals.  Walking along the narrow path, I was deafened as one exploded in song next to my ear.  Two  Long-tailed tits fell fighting out of a tree and continued grappling on the ground, peeping in rage.  Blackwinged stilts sorted out their issues over in the flooded meadow. In the lagoons Great crested grebes ceremoniously fanned out their crests.

List of birds seen

Stork, yellow wagtail, skylark, zitting cisticola, black-winged stilt, spoonbill, shoveller, crane, purple heron, grey heron, little egret, cattle egret, great egret, nightingale, cetti’s warbler, goldfinch, great tit, blue tit, long tailed tit, chiffchaff, stonechat, starlings, house sparrow, raven, jackdaw, pheasant, partridge, mute swan, marsh harrier, kestrel, buzzard, red kite, swallow, common swift, alpine swift, kingfisher, great crested grebe, little grebe, teal, garganey, gadwall, shelduck, hoopoe, green woodpecker, great spotted cuckoo, corn bunting, coot, moorhen, scops owl (heard).

Some practical information

  • Castelló d’Empúries makes an excellent base for exploring the Aiguamolls reserve on foot:  the coastal area around the Cortalet and the inland Vilaüt hide are equidistant and connected by well-marked GR trails.
  • On holidays, after 11.00am, the Cortalet site (with its information centre, car park and picnic area)  is the preserve of families. So children can enjoy the experience, they’re allowed to shout and run in and out of the trembling hides (most of which are built on stilts).  But my only ever sighting of a bittern was precisely on a day like this. The Vilaüt area is usually very peaceful.