Definition of "birdwatching"

In fact, on this night, the birdwatching is over for everyone, for the firing is cancelled. Nobody notifies birdwatchers officially, of course, so the exodus is scattered and gradual.

1957, Skyline, volumes 15-18, page 7

By the spring of 1968, they were the secular-singing O'Kaysion, and they had recorded a leering lyric about ogling babes for the peewee Northstate label. Local DJs, appreciating that bird-watching was a popular pastime for their listeners, rode the number as if it had a satin saddle.

1990, Wayne Jancik, The Billboard Book of One-Hit Wonders, page 225