Farbfoto
CC BY-hauptsachmaisgsund
SA 2.0
Farbfoto
CC BY Chris eisenbahner 2.0
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Schwarz-weiß-Foto
CC BY Charlotte Astrid 2.0
Farbfoto einer gefüllten Kaffeetasse mit Schnurrbart
CC BY coffee_circle 2.0
Farbfoto
CC BY-Ryan Somma SA 2.0
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Pelican Eggshell Affected by DDT
Farbgrafik
CC BY-Martin-rnr SA 3.0
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Schema der Anreicherung von Schadstoffen in einer Nahrungskette
Farbfoto
public domain
http://en.wikipedia.org/wiki/Public_domain
The Brown Pelican (Pelecanus occidentalis), an endangered species, feeds on schooling fish near the ocean's surface by plunging beak-first from the air. The chemical DDT almost caused the demise of the brown pelican back in the 1960's. Pelicans exposed to DDT laid eggs with thin or non-existent shells, which broke during nesting, thus reducing the number of surviving offspring. Since DDT was banned in 1972, brown pelicans have made a remarkable recovery. There are permanent brown pelican nesting colonies on both Anacapa and Santa Barbara Islands.
Farbfoto
CC BY wissenschaftsjahr 2.0)
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Farbgrafik
CC BY-Stefan-Xp SA 3.0
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