Together with Cornell, Audubon created eBird, an online database for bird observation.

This enthusiasm he shared with his younger brother Edward: the two carried out bird observation when they were together and corresponded whenever they were apart.

The visitor center also has a bird observation and attraction area.

His 1916-18 journals record his war experiences and also his off-duty bird observations and sketches behind the lines in northern France.

Around the lake is a cycle way which provides access to bird observation hides.

Probably the longest-running are those for bird observations (for example: e-bird, http://ebird.org).

In the earliest days of ornithology, collecting was the dominant method of bird observation and study.

It consists of bird lagoons and bird observation hides, including a rotary hide.

Cattail Wildlife Refuge - approximately 500 acres (2 km2), with tower for bird observation.

Both are popular places for bird observation and the Wildlife Area is popular with seasonal waterfowl hunters.