What is the average weight in grams of an american robin?

American Kestrels (along with the Red-tailed Hawk) are one of two raptors almost universally used by new (apprentice) falconers in the United States. The American Kestrel is generally considered to be a harder bird to care for due to its small size, quick metabolism, and fragile nature (in comparison with the much larger Red-tail and other raptors used in falconry) and requires extensive weight management, often within a couple tenths of a gram.