These tables are to help you find rookeries to count for the 2022-23 survey.
For this survey, you can register to do a full survey of priority tetrads, and/or submit casual records of rookeries from anywhere.
If you visit any of the sites listed in the tables below, and do not find any rooks nesting, please still enter the data as a zero count, so that we know it has been checked. There are likely to be plenty of rookeries that we do not know about, and some rookeries that will move to a new group of trees.
These tables have been compiled from various sources including bird reports, breeding bird atlas data, detailed local studies, BirdTrack, etc. There was no standardised method of data collection for historical records, so it is impossible to eliminate all inconsistencies.
Where a count is given in the tables below, it is the highest count of nests in that decade.
A zero count means there were definitely no nests seen (although we don’t necessarily know exactly when the last occupation was). Note that in 1996 there was a national survey in which random tetrads were surveyed, some of which had zero counts but no known earlier records. A blank means there is no data – probably because the site wasn’t recorded in that decade.
Where there is a named rookery in a tetrad, that does not mean it is the only rookery there. Where the tetrad reference appears in the place name column, that is the only information available.
The same rookery may have been given different names by different observers.
Where a particular named rookery appears in more than one tetrad, it may be that:
- it is located on the border
- the rooks have moved across the border to a different clump of trees
- the nests are sufficiently spread out that it really does cross the border (the rooks aren’t reading the maps first!)
- the surveyor estimated the grid reference incorrectly (especially in the days before GPS and aerial photos)
- different surveyors estimated the grid refs differently
- For some sites, we have only a place name, and the grid reference from that
- The nearest place name is not necessarily in the same tetrad as the rookery
- A detailed local survey (eg at St Davids) may divide a single rookery into smaller pockets of activity
Do not worry about these inconsistencies. These tables are purely to help you find rookeries to count for the present survey. We may be able to iron out a few more of these inconsistencies in the future.
We can provide extra details about tetrads with named rookeries – email here – giving the tetrad name or the 10km sq, or your postcode, so we know what area you are interested in.
Please enter your records (even if it is a zero count at a previous site)
Download Instructions for entering records here