Summarizes population changes of 222 bird species reported on >50 permanent breeding bird survey routes during 1987 and 1988. Compares with annual trends between 1966-87. Includes maps and statistical tables.

Routes are selected at random on the basis of one-degree blocks of latitude and longitude. Each 24.5 mile route, with 3 minute stopes spaced one-half mile apart, is driven by automobile. All birds heard or seen at the stops are recorded on special forms and the data are then transferred to machine punch cards.

1966-75 activities of the Breeding Bird Survey to detect and measure year-to-year and long-term changes in population of birds, particularly the smaller land birds.

In this book there are entire chapters devoted to the most widely used bird counting techniques, and attempts to amalgamate other counting methodologies into major groups were made. Examples of the use of methods are provided wherever possible and the relative value of various approaches for answering specific questions is also addressed. A newly revised edition of the immensely successful Bird Census Techniques An entirely new chapter covering the census methods recommended for tropical habitats Provides a concise guide to various census techniques and their opportunities and pitfalls