Re: the idea that the average number of bird spp seen on a visit to a place
is about half the total number of spp on the site list.
At the risk of seriously gripping off large numbers of people I could relate
how on a recent birding tour of Costa Rica we spent one morning on a forest
trail and saw 45 - 50 spp (with the aid of tapes and a very knowledgeable
leader), the next day we spent the same amount of time on the same trail,
saw very few of the birds we had seen the day before, but saw another 35 -
40 spp!
What would have happened the next day I don't know, but we had to move on,
so I never got to find out!
John Leonard
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