Passage and table adapted from "Why Leaves Change Color" on "Northeastern Area," a website by the USDA Forest Service. <https://www.na.fs.fed.us/fhp/pubs/leaves/leaves.shtm>.

There are two main types of trees: coniferous trees and deciduous trees. Coniferous trees have small, needle-like leaves. They keep these leaves all year. One example of a coniferous tree is a pine tree, which has green needles during all seasons. In contrast, deciduous trees lose their leaves every autumn. Before these leaves drop and blow away, they change from green to colors like red, orange, yellow, and brown.

Have you ever wondered why deciduous leaves change color in the fall? This color change is caused by a chemical process in the cells of tree leaves.

Green leaves are green because they contain a green molecule, chlorophyll. This is a very important molecule in the natural world. Leaves use this molecule to turn carbon dioxide, sunlight, and water into sugar and oxygen in a process called “photosynthesis.” So, chlorophyll lets the plant store energy as sugar, which it can use as food. It also lets the plant provide food for anything that eats it, like a cow, a bird, or even a human! 

So, what does chlorophyll, a green molecule, have to do with autumn leaf colors? Deciduous leaves also contain molecules of other colors, but the chlorophyll in the leaves covers them up in the summer. In the fall, deciduous trees stop making chlorophyll. Eventually there is no more chlorophyll in their leaves. The colors of the other molecules show through. The colors of these other molecules are the colors we see in autumn leaves. The next time you see colorful leaves in the fall, you’ll know more about the chemistry at work!

Passage 1: Adapted from "The Busy Blue Jay" in True Bird Stories from My Notebooks by Olive Thorne Miller (1903). 
The following passage is from a book in which the author talks about raising and releasing into the wild birds that had been captured and sold as pets. 

One of the most interesting birds who ever lived in my Bird Room was a blue jay named Jakie. He was full of business from morning till night, scarcely ever a moment still.

Jays are very active birds, and being shut up in a room, my blue jay had to find things to do, to keep himself busy. If he had been allowed to grow up out of doors, he would have found plenty to do, planting acorns and nuts, nesting, and bringing up families. Sometimes the things he did in the house were what we call mischief because they annoy us, such as hammering the woodwork to pieces, tearing bits out of the leaves of books, working holes in chair seats, or pounding a cardboard box to pieces. But how is a poor little bird to know what is mischief?

One of Jakie’s amusements was dancing across the back of a tall chair, taking funny little steps, coming down hard, “jouncing” his body, and whistling as loud as he could. He would keep up this funny performance as long as anybody would stand before him and pretend to dance, too.

My jay was fond of a sensation. One of his dearest bits of fun was to drive the birds into a panic. This he did by flying furiously around the room, feathers rustling, and squawking as loud as he could. He usually managed to fly just over the head of each bird, and as he came like a catapult, every one flew before him, so that in a minute the room was full of birds flying madly about trying to get out of his way. This gave him great pleasure.

Wild blue jays, too, like to stir up their neighbors. A friend told me of a small party of blue jays that she saw playing this kind of a joke on a flock of birds of several kinds. These birds were gathering the cherries on the top branches of a big cherry tree. The jays sat quietly on another tree till the cherry-eaters were busy eating. Then suddenly the mischievous blue rogues would all rise together and fly at them, as my pet did at the birds in the room. It had the same effect on the wild birds; they all flew in a panic. Then the joking jays would return to their tree and wait till their victims forgot their fear and came straggling back to the cherries, when they repeated the fun.