NEET BIOLOGY

Detailed explanation-1: -There are two ways to count large flocks of moving birds: using a ‘larger-than-1’ counting interval again; or by counting rate: birds passing per unit of time. Your method depends on the situation you face and the species you’re dealing with.

Detailed explanation-2: -Point counts are another of the most commonly used survey techniques for determining avian species composition and abundance. Point counts are essentially strip transects of zero length in which the observer performs the count in a 360º arc around a fixed survey station.

Detailed explanation-3: -The number of birds in large flocks is generally estimated by mentally dividing the birds into groups, which may vary from five to 1, 000 depending on the size of the flock, and counting the number of groups. Notebooks and tally counters may be used to aid counts.