Trektellen

Trektellen collects the disciplined repetition behind migration watching. Participating sites enter visible migration counts, ringing captures or nocturnal flight-call records, producing current tables and long time series by place, date and species. A birder can see what passed a watchpoint recently, compare seasonal totals or learn which sites consistently monitor a route. The database is particularly strong in Europe but includes stations elsewhere, and its accumulated records make a migration day part of a history rather than an isolated list.

Numbers from two sites are not automatically comparable. Count duration, field of view, weather, observer numbers, identification rules and the geography that funnels birds can all differ. A large total indicates passage at that monitoring point, not the full population moving through a region, and quiet days may reflect poor detectability as well as low movement. Method information is not equally prominent for every contribution. Trektellen is therefore valuable for following named stations and repeated patterns, with careful attention to protocol before drawing broader population conclusions.