Form and function
Gastric motility was markedly reduced for most of the incubating birds, with lower motility probably associated with a better conservation of stomach content. The duration of the incubation period varies between different species with the eggs hatching once it is over. It should be examined in every bird! The conversion of agricultural land to urban and suburban development, and the loss of suitable nesting sites such as large, hollow trees and old buildings have caused a decline in Barn Owl numbers. There was a problem with your submission.
The origin of birds
When you are considering the potential benefits of products look for meta-analysis studies that take in all the sound research available. One-off studies that get a significant result are not evidence of anything. Only when an effect is repeated in many studies by many scientists should you believe.