When you wish to report a rare bird, please use the downloadable form found on this page. You can choose the Spanish or English version and fill it out in one of the two languages. The form should then be sent to together with any supporting documentation. The report will then be passed around to the members of CERO for voting. All accepted reports will be published by CERO as early as possible the following year. In the publication, the name(s) of the observer(s) will appear after each observation and that of the observer who first found the bird will be marked with an asterisk (*).

If you have seen (or heard) a bird (or birds) that should be revised by CERO before publishing, you should describe it (them) as thoroughly as possible using your own words as much as you can. Describe as many details as observed. It may be obvious to the observer what the bird in question was, but that needs to be put into words for CERO to be able to make as fair a judgement as possible. Comparisons to field guide illustrations or images are often beneficial, but a report that simply refers to an image in a book is of little value. Your description should also describe how you excluded similar species. This is very important! Also write what your previous experiences are with the species in question and similar species it could be confused with (number of times observed, plumages, etc.). Sketches made in the field are often valuable; even a simple sketch can be more descriptive than words. A sketch can be scanned or photographed and attached to the form. If you have photos, video or tape recordings to support the identification of the bird, CERO will require these. Fill out the form as soon as possible after the observation was made, while your memory is still fresh.

The definition of ‘Accepted’ means that the observation has been approved by CERO for publication. ‘Rejected’ means that the observation has not been accepted for publication. This does not necessarily mean that the observation is wrong (unless documentation clearly shows that), just that insufficient documentation was presented to CERO.