Screaming parties are groups of two or more birds flying and calling loudly at low level - at or just above rooftop height - which means they are most likely breeding nearby.
Screaming parties seen and heard in May are likely to be experienced breeders, but in June and July are probably younger birds pairing up for the first time.
Please don't report sightings of birds higher in the sky or feeding over water as they may be from some distance away.
For more information about swifts, including help with identification and nest boxes, please visit the Wildlife Trust BCN Help our swifts information page.
If this is your first record submission, please read our quick guide to Using the NBRC Website to Submit Biological Records.
If you would like to submit more than one sighting or plan to submit sightings on a regular basis, please create an account before you submit your sightings. You will then be able to view, edit and download all your submitted records.
Please note that submitted records don't appear on the My Records and All Records pages straight away. We would advise that you check these pages the following day.