What is a Daily Estimated Total (DET)?
A daily estimated total estimates the numbers of birds of each species that were present in or passing through a specified area and were detected by observers on a given day. There are several components of a daily estimated total, and this varies among CMMN stations. At most stations, the DET is derived from a combination of (1) census (a standardized route in which all birds seen or heard along the route are counted), (2) total number of birds banded, (3) incidental observations recorded by observers throughout the day. Some CMMN stations also perform a visible migration count of birds flying over the station. DETs are used to analyze trends of migratory landbirds across Canada.
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