Thursday, 19 April 2018

Tracking the rare

Common Tern - a scarce species in Extremadura (Martin Kelsey)

Birding is thriving in Extremadura. This is driven partially by the numbers of people visiting through "turismo ornítologico" - the rather formal-sounding Spanish description for people coming to Extremadura for birding holidays  - but mainly by the growth of birding amongst those who live here, especially young people. There is an email forum with several hundred participants. All this translates to a huge increase in the number of person hours that are being spent in the field, both in terms of participating in survey work and censuses (such as the annual Common Crane census), engagement with eBird (now holding over 13,000 submitted checklists) or simply birding.

Couple this with digital photography, better optics and access to first class information, the quality of the observations and increasing skills of the observers, are, I am sure, also improving. And through this, so more and more scarce or rare species are being reported.

A group of us felt that it was time that Extremadura followed the example of some other regions of Spain and established a local Rarities Committee, to work with the local recorders as well as the national body, to ajudicate on records submitted. Thus would be established an independent and objective verification of sightings of unusual birds. This would ensure that the key information concerning records would be standardised and stored,along the decision from the ajudicators. Records of birds that are considered as national rarities would still require acceptance from the national rarities committee, but perhaps what is most interesting would be the monitoring through the local committee of the changes through time of the status of scarce species in Extremadura.

The first report is now available and you can see it through this link. It has been achieved through some quite considerable hard work, aiming to review not just records from the last couple of years, but following up records dating back almost twenty years. There is still a backlog of old records to be reviewed and incorporated, and I urge anyone with records of any of the species listed by the Committee to submit them (which can be easily done on-line). Over time the annual report will be more and more focused on the most recent.

The number of records received of certain species  such as Audouin's Gull, Mediterranean Gull and Ring Ouzel are such that they can no longer be considered as rarities in Extremadura. The latter is clearly a regular passage migrant, with stopovers especially in Badajoz province, with small numbers probably overwintering there regularly. With the advent of eBird recording, the ongoing situation of these species can be monitored.
Cream-coloured Courser May 2017 (Carlos González Villalba)
Some species in the report are particularly intriguing. Last year, Cream-coloured Coursers were recorded from three different locations in Extremadura during May. Two of these locations involved pairs of the species. Last year also saw breeding of the species in mainland Spain, for only the third time. Did the species breed in Extremadura as well last year? No one knows. Are we seeing the start of the spread of this North African species into the Iberian Peninsula?

The acronym for the Extremadura Rarities Committee is CREX (Comité de Rarezas de Extremadura). which is also the genus of Corncrake. The report includes records of this species too. The evidence from injured or dead birds found suggests that Corncrakes (whose Spanish name means the Quail's guide) pass through Extremadura at the same time and in the same habitats as migrating Quail....but a healthy, live Corncrake has never been seen by a birder here. Now there is a challenge!

The next report will be published sometime in the first quarter of 2019...and without spoiling the ending, I can tell you that there will be some more fascinating discoveries. Take a look at the website for updates of unusual birds being reported in Extremadura - and if you find something yourself, do send in the record!