Black-crowned Night-Herons and Snowy Egrets at Alcatraz, Part 1

In a brown bag presentation for employees and friends of the Golden Gate National Recreation Area, Roger Hothem of the USGS introduces the breeding Black-crowned Night-Herons and Snowy Egrets of Alcatraz Island. Hear about the history of the birds on Alcatraz, their significance as ecological indicators, how they are monitored, and basic results after more than 20 years of monitoring.

Category:

Science & Technology

Tags:

• birds
• Alcatraz
• environment
• predators
• nature