2025 Release - North American Breeding Bird Survey Dataset (1966 - 2024)

The 1966-2024 North American Breeding Bird Survey (BBS) dataset contains avian point count data for more than 700 North American bird taxa (species, races, and unidentified species groupings). These data are collected annually during the breeding season, primarily in June, along thousands of randomly established roadside survey routes in the United States and Canada. Routes are roughly 24.5 miles (39.2 km) long with counting locations placed at approximately half-mile (800-m) intervals, for a total of 50 stops. At each stop, a citizen scientist highly skilled in avian identification conducts a 3-minute point count, recording all birds seen within a quarter-mile (400-m) radius and all birds heard. Surveys begin 30 minutes before local sunrise and take approximately 5 hours to complete. Routes are surveyed once per year, with the total number of routes sampled per year growing over time; just over 500 routes were sampled in 1966, while in recent decades approximately 3000 routes have been sampled annually. No data are provided for 2020. BBS field activities were cancelled in 2020 because of the coronavirus disease (COVID-19) global pandemic and observers were directed to not sample routes. In addition to avian count data, this dataset also contains survey date, survey start and end times, start and end weather conditions, a unique observer identification number, route identification information, and route location information including country, state, and BCR, as well as geographic coordinates of route start point, and an indicator of run data quality.

1966年至2024年北美繁殖鸟类调查（North American Breeding Bird Survey, BBS）数据集涵盖700余个北美鸟类类群（含物种、亚种及未鉴定类群）的鸟类定点计数数据。该数据于每年繁殖季（主要为6月）在美国和加拿大境内数千条随机布设的路边调查路线上采集。每条调查路线长约24.5英里（39.2千米），以约半英里（800米）的间距设置计数停留点，总计50个点位。在每个停留点，一名精通鸟类识别的公民科学家将开展3分钟定点计数，记录半径四分之一英里（400米）范围内所见鸟类及所有听到的鸟类个体。调查于当地日出前30分钟启动，单条路线全程耗时约5小时。每条路线每年仅开展一次调查，年度采样路线总数随时间逐步增长：1966年仅采样约500条路线，近数十年来年均采样路线约3000条。2020年无相关数据集发布，因新型冠状病毒病（COVID-19）全球大流行，当年野外调查活动全部取消，观察员被要求不得开展路线采样工作。除鸟类计数数据外，该数据集还包含调查日期、调查起止时间、起止时段的天气状况、唯一观察员识别编号、路线识别信息（涵盖国家、州级行政单元及鸟类保护区域（Bird Conservation Region, BCR））、路线起点的地理坐标，以及调查数据质量评级指标。