Skip to main content
U.S. flag

An official website of the United States government

Publications

These publications showcase the significant science conducted in our Science Centers.

Filter Total Items: 16783

The season--April, May, June, 1972

No abstract available.
Authors
C.S. Robbins

Endangered birds in Hawaii

No abstract available.
Authors
W. Banko

California condor survey, 1971

No abstract available.
Authors
W.D. Carrier, R.D. Mallette, S. Wilbur, J.C. Borneman

Copulation by California condors

Koford (Res. Rept. No. 3, Natl. Audubon Soc., 1953) observed sexual display among California Condors (Gymnogyps californianus) on more than 30 occasions, yet only once did he see what he thought was copulation. Some of the displays he watched were quite intricate, with considerable posturing and "male" aggression, but no such activity preceded this copulation. The birds sat several feet apart for
Authors
S.R. Wilbur, J.C. Borneman

A new species of warbler (Parulidae) from Puerto Rico

The West Indies are among the best known of the world's tropical regions, and our knowledge of the distribution of indigenous land birds in the Greater Antilles has been thought to be nearly complete (Bond, 1956). The last new species from the Antilles were described in 1927, the results of work in the Zapata Swamp of Cuba (Barbour and Peters, 1927) and the isolated Morne de la Selle in Haiti (We
Authors
C.B. Kepler, K.C. Parkes

Distribution and numbers of the California condor, 1966-1971

No abstract available.
Authors
S.R. Wilbur, W.D. Carrier, J.C. Borneman, R.D. Mallette

National survey of blackbird-starling roosts

No abstract available.
Authors
J.S. Webb, W.C. Royall