If you're six feet tall, 10 miles per hour probably doesn't feel very fast. But what if you were just six inches tall, like a squirrel? It would feel quite a bit faster. This site shows the actual speeds of animals and how fast they would be going if they were your size.
California Condor
eider duck
frigatebird
Gannet
mallard
pigeon
Red-breasted Merganser
red-tailed hawk
Spur-winged Goose
White-throated Needletail
Site concept, design, and creation by Alex Reisner. Source code and original content available under the Creative Commons Attribution-Share Alike 3.0 license. Animal descriptions are from Wikipedia and some silhouettes are from All Silhouettes.