My Best Nest: A Purple Martin Story
Bar graph activity
Purple Martin NestlingsEnemy #1: StarlingEnemy #2: House SparrowMartin HooligansFeeding time!Bird features"My Best Nest," the bookA tale of beginningsBibliographyUseful linksActivities for kidsStudent ExercisesFor librariansAuthor and contributorsBuy the book

Bar graph activity

Let us start with an "egg-cellent" bar graph.

First, print out the following illustration:
3 Eggs 

It is my artistic version of a bar graph comparing the egg length of the three species cited below. Research what the eggs of the following three birds look like:

House sparrow (Passer domesticus) average egg size 22.1 mm x 15.5 mm.
Purple martin (Progne subis) average egg size 24.9 mm x 18.5 mm.
European starling (Sturnus vulgaris) average egg size 30.2 mm x 21.3 mm.

Notice the three eggs are different sizes. Color the three egg outlines according to the three species of birds above, so each egg has the correct size and coloring for the species. Which egg will be marked with brown splotches? Which egg will be colored blue? Which egg will be left white?

Using the NCES Kid's Zone web site create your own bar graphs with labels to compare the eggs of House sparrows, Purple martins and European starlings.

Egg length data obtained from "The Bird Life of Texas" by Harry C. Oberholser.
University of Texas Press, Austin, TX, copyright 1974. ISBN 0-292-70711-8