Recently, Robin found an article on weight loss in incubating birds. She sent the information to Bill Heinrich at the Peregrine Fund and here is their discussion. Enjoy.
I was reading about the incredible weight loss that takes place in Eagles during brooding.
Each egg is 3.5% of body mass. During egg laying, brooding incubation and nesting, the female looses 14.4% of her body weight. [every two weeks?] If that same % is applied to a female Peregrine weighing approx 2 lbs, she would lose 0.07 lbs / egg. or for this female on Cap One 4 eggs = 0.28 lbs ending up weighing 1.72 lbs or 86% of her pre-egg laying weight.
Comparing that to a 200 lb woman –> a loss of 28 lbs in two weeks. She would weight 172 lbs … a diet I could wish for….. and -28 lbs in another 2 weeks? Down to 144 lbs …. my ideal!
Are the percentages correct? Thanks – it may be interesting to blog this if it is correct…
And then from Bill Heinrich,
… I have not paid any attention to the weight loss in Peregrines as our birds are never handled and weighed. It does seem to make sense and I believe the figures you give are probably pretty accurate. If I hear any more on the matter I will pass it along. I have enjoyed your notes on our Peregrines.
An interesting discussion. Cheers! May 17 – 21: Magic dates?