Bird Sizes: Is it Bigger or Smaller Than a Robin?
Birds come in many sizes. We can use a field guide to look at a picture of a bird, but the book isn't big enough to make them full-sized. Instead, they have a small picture (just like you are small in pictures) and use numbers to show how long they are from beak to tail.
When you see a bird outside, it is good to compare it to the size of a bird you know. Since an American Robin is a common bird, and is medium-sized, many people use the robin as a point of reference.
We used our field guides, yardsticks and a life-sized robin silhouette to compare the size of common birds to the robin.