There is variation in the weight of all birds and across species. Anna's Hummingbirds which are very common in N.California and along the west coast weigh about .15 ounces each, or a little less then...
Sometimes yes but sometimes no. You see, if a bird is heavily breathing, it could just be yawning. But if it's breathing heavily on a daily basis or for several hours, it would be most likely have a...