I have observed a large number of Argus Pheasant, Rhinoceros Hornbill and Helmeted Hornbill feathers in trade and I would like to estimate the number of individual birds required to account for these feathers. I therefore need estimated numbers of tail feathers and wing feathers for each of these species (a range is fine). Are there any resources that could help me or is there anyone who has knowledge of this.

Many thanks in advance,

Daniel

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