Acorn woodpeckers create acorn granaries that hold tens of thousands of acorns. Scientists are especially interested in their living arrangements, once described by Cold War ornithologists as communism. Read the rest
Here's a diagram that shows the relative size of a great grey owl's body to its feathers. It's hosted on Wikimedia commons, labelled "Cross sectioned taxidermied Great Grey Owl, Strix nebulosa, showing the extent of the body plumage, Zoological Museum, Copenhagen."