Search this Site

Birds of Northumberland links

Important Links

 

NLT Logo revised Feb 2015

 

 

 

 

Birds of Northumberland

Basic Summary

This report lists all species that occur in the data together with their earliest and latest dates, maximum number seen, number of records, and number of years represented in the data. Species with no dated records are not included.

The definitions used in the report are given below.

  • Earliest Date and Year  Gives the date of a sighting for this species closest to January 1. Note that “earliest” is a misleading adjective for those species that arrive in the fall and depart in the spring. Note also that for records with inexact dates the day will be 0 when only a month and year are recorded.
  • Latest Date and Year  Gives the date of a sighting for this species closest to December 31. Note that “latest” is a misleading adjective for those species that arrive in the fall and depart in the spring. Note also that for records with inexact dates the day will be 0 when only a month and year are recorded.
  • Maximum Number Seen  Gives the largest number of individuals recorded. Since summary records are included here, Christmas Bird Counts for example, some caution must be used with this number.
  • Number of Records  Gives the number of records possessing a date in the data set for this species.
  • Number of Years  Gives the number of years that this species has been recorded.

Note: Some species are not included in this report because their records lack dates.

Basic Summary - Split Year

This report is a variant of the Basic Summary and divides the year into two halves: January 1 - June 30, and July 1 - December 31; with dates given for each half. This is to eliminate the problem presented by species wintering in the county, as these would all show arrivals of January 1 and departures of December 31 if the full year alone was used. It also has the potential advantage of showing separate arrivals and departures for spring and fall, although in practice individuals of most passage migrants have lingered over the mid-year break point.