The 20-minute search - a simple method for counting forest birds.  R. H. Loyn.  October 1985.  6 pp. (unpubl.)

SUMMARY

A simple method is proposed for estimating relative abundances of forest birds. An unmarked area of about 3 ha is searched for 20 minutes and all birds seen or heard are counted. The method has been used widely in Victoria and its scope and limitations are discussed.

Also published:

Loyn, R.H. (1986)  The 20-minute search - a simple method for counting forest birds.  Corella 10 (2): 58-60.