Originally Posted by Ch'i

If you compare the size of the birds foot to a directly proportional mini-chimney interesting similarities can occur. For the sake of science, let's use a Pacific Parrotlet (Forpus coelestis coelestis); being of small bird size (comparably to the plane).

The average weight of a Pacific Parrotlet[/URL], also known as the Ridgway's Parrotlet, can be noted as an average of 31-34 grams.