During the past breeding season of the primitive kestrel in Trujillo, since the appearance of the first kestrels in the breeding colonies from their wintering areas, I was very attentive to the location of ringed birds and reading
In total, it has been possible to locate and read the ring codes of a total of 17 kestrels in different buildings in Trujillo.
total of ringed birds, 7 correspond to returns of birds that were already detected during the breeding season of 2016 (either as breeding adults or as immature of the 2nd calendar year aquerenciated to a greater or lesser degree to breeding colonies) and 10 correspond to new locations of ringed birds that were not previously detected.
In addition to these color PVC ring and alphanumeric code readings, we have detected at least 6 different birds that only carried the official metal ring, in these cases, although these rings can not be read at a distance and therefore it is not possible to ascertain the identity, origin or origin and usually nor the age of the bird (except transition plumage), it does help us to differentiate them from the other individuals of the colony, helping us to understand what happens and what is the dynamics of breeding colonies and learn about the behavior of these birds.
Most of the kestrels that are ringed in Trujillo and other localities of Extremadura, are marked with colored PVC rings and code alphanumeric, usually carry colored PVC in one leg and an official metallic ring of MAPAMA (Ministry of Agriculture, Fisheries, Food and Environment) in the other. The color used in recent years has been red, although there were also some years in which it was ringed with blue or green PVC, with the inscription of the code always white.
But in addition to all that, collaborating in reading rings, picking up the telescope, looking for ringed birds and being able to read the codes to identify the birds, is a rewarding and even exciting task when you witness the return of birds, or whenever you can locate a new specimen that you had not seen before or a new season arrives and those breeding birds that you know from previous years return, or you see as less veteran specimens return with the intention of incorporating themselves as breeding stock, or those immature specimens that visit the colony when the spring is advanced and are those that you saw the year before as chickens exercise their wings and make their first flights.
To collaborate in reading primanna kestrels, usually it is essential to use the telescope and with the possibility of using the zoom to more than 40 magnification (40 X) and that the optical characteristics of the equipment does not s offer enough definition to be suitable for this task. With a terrestrial telescope we can also resort to photographing ringed birds using the technique of digiscoping.
Ringed female photographed using the technique of digiscoping.
They can also bridge cameras with an optical zoom of more than 40 x allow us to photograph the bird, which will give us information about its general condition, its changes and possible individual details of the bird, or even to take photographs of codes that are incomplete due to the position of the bird, which could help in the attempt to identify later.
It is very useful to know the habitual innkeepers and it is not less important to know the situation of the most favorable observation points, taking into account the distance, the height at which we are in relation to the innkeeper, the time for orientation and the intensity of the light and also to take advantage of the peaks of maximum activity of the birds.
The date is a condition of special importance, since according to the date in which we are, we can expect some findings u others, for example:More news: TEACHING & amp; LEARNING ENGLISH - TEACHING AND LEARNING SPANISH: IT IS PROHIBITED
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From mid-February to mid-late April:
Throughout this period of more than 2 months, , the formation of pairs and the selection of nidales that will occupy to create.
In this period we can expect mainly the arrival of adult breeding, sometimes with the incorporation of a new player or with the return of known birds that have already been reproduced in previous years in the same colony, we can also see the degree of fidelity to the nests of the previous year, if they use them again or if there are changes of location. > May is a month in which the activity in the colonies is reduced to the minimum due to the incubation and therefore it is usually less productive to look for birds with rings. But if we have time, it is never a bad idea to take a look at the busiest hours in the colonies.
Late May, June and July:
Starting in late May they begin to be born the first chickens, which causes that the activity goes back to the colonies, since the chickens demand food and as they are being born and growing inside the nests, the comings and goings of the adults with food are multiplied. / p>
During this period when chickens grow and colony activity increases, it is very common to see non-breeding birds visiting the colonies, sometimes it could be non-breeding adults or birds from other nearby colonies and have failed in their breeding attempt and have not made a second breeding attempt. Much more frequent is the appearance of a large number of immature birds, born in the previous breeding season, whose return from Africa is usually much later and rarely reproduced the year after the birth and if they do, it is very late. Among these immature birds there is a high proportion of ringed birds, since many of them will come from some of the great colonies where they are ringing annually, although we may also have surprises and find birds of a more distant origin.
This type of observations of immature individuals are very interesting because they give us information about the degree of return, dispersion or survival at the first year of life of some birds that could be incorporated as reproducers to the next breeding season. / p>
Immature male with transitional plumage of 2nd calendar year. Therefore born in 2016 and photographed in June 2017. It has a metal ring on the left leg.
At the end of the breeding season, in the colonies where they are tagged, observe the chickens or young people in the period after the banding and before leaving the colony, the rings allow us to identify them individually and know their status, behavior and evolution in the colony before emancipation and abandonment of it. In short, it helps us to continue learning more about the reproductive behavior of this species.
I wanted to remind those who go out to observe birds provided with a telescope or camera, that an observation or photograph of a bird with ring can be very interesting to make a contribution to the study of a threatened species such as the kestrel, for that alone it is necessary to pay attention to the legs of the primitive kestrels and when you observe some ring in this species, to communicate it later.