Passage 1: Rabbits, Stoats, and Kiwis: The Ecology of New Zealand (2016)

The island nation of New Zealand is unique. Many of its animals and plants are found nowhere else. The kiwi is one of the most famous of these animals. This small, flightless bird dwells on the ground. It has tiny wings with which it is unable to fly. Kiwis belong to the same biological family as ostriches and emus, but they are much smaller than their relatives. Kiwis have round bodies and long beaks, and their brown feathers are very long and thin. Because of this, at first glance, someone who has never seen a kiwi before might think it has fur! 

New Zealand is particularly fond of the kiwi. It is the country’s national bird. New Zealanders are even sometimes referred to as “kiwis.” Unfortunately, the kiwi is in danger due to changes humans made to New Zealand’s environment.

Hundreds of years ago, European colonists decided to bring rabbits from Europe to New Zealand. They wanted to hunt them for food and for sport. Unfortunately, their plan succeeded too well. In Europe, other animals in the food chain eat rabbits. This keeps their population in check. In New Zealand, though, no animals ate rabbits. So, their population grew to an enormous size. There were way too many rabbits! 

The colonists tried to fix the problem by bringing another animal to New Zealand. Since none of New Zealand’s animals ate rabbits, the colonists imported one from Europe that did: the stoat. Stoats are small, carnivorous mammals similar to weasels. They eat rabbits, as well as birds and their eggs. Bird scientists warned the colonists to reconsider their plan, but the plan went forward—to the kiwi’s detriment.

New Zealand’s islands historically lacked predatory mammals. Because of this, kiwis’ flightlessness never put them at a huge risk of being hunted and eaten. This was the case until the stoats were released. The stoats began to eat the kiwis and their eggs in huge numbers. The kiwis had no way of protecting themselves from the stoats. As a result, their population plummeted. 

To this day, stoats threaten the kiwi population in New Zealand. To protect native wildlife, residents have to tried to use various methods of trapping and hunting to limit the size of the stoat population. Certain areas have also been fenced in to keep stoats away from native birds like the kiwi.

To function, environments maintain a careful equilibrium between predators and prey. Altering this balance purposely or accidentally can have serious consequences.

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Passage 2: Unwanted Guests: The Dangers of Invasive Species (2016)

Groups of different animals affect one another in the natural world. For example, imagine that wolves and deer live in an area. A certain number of wolves need to eat a certain number of deer to survive. This keeps the population of the deer from getting too big. Similarly, the deer eat grass and vegetation. If there were more deer, they’d need to eat more grass.

The natural world is full of balances like these. Unfortunately, sometimes these balances are upset by invasive species. An invasive species is an animal or plant that has moved or been moved from its original environment to a new one. It has established a stable population there that is causing problems. Invasive species don’t cause problems in their original environments because they are kept in check by other plants and animals. In new environments, though, they have nothing stopping them from taking over.

One example of an invasive species is the zebra mussel. This animal originally only lived near Russia. Zebra mussels got into the Great Lakes by attaching themselves to the bottoms of ships. They now live in the Great Lakes too, where they upset the ecosystem. Zebra mussels eat algae, but so do fish. Many fish die as a result of there not being enough algae for all the animals to eat.

Plants can be invasive species too. Another example of an invasive species is the kudzu vine. Humans introduced the plant to the United States on purpose. Farmers were encouraged to grow it to protect their soil. Since then, it has gotten out of control. It now covers large parts of the South, outcompeting native plants for resources like water and sunlight.

Invasive species can cause environmental problems that are very difficult to fix. Because of this, it’s important to rethink introducing any species to a new environment. It’s also important to check to make sure when traveling that you are not bringing any plants or animals with you!

Passage 1: Passage and illustrations adapted from "How Sun, Moon, and Wind Went Out to Dinner" in Indian Fairy Tales (1892; ed. Joseph Jacobs, illus. John D. Batten)

^{Image "Common Core Fifth Grade CCSS.ELA-LITERACY.RL.5.3 - Compare and Contrast Two or More Characters, Settings, or Events  - Image 1" adapted from "How Sun, Moon, and Wind Went Out to Dinner" in Indian Fairy Tales (ed. Joseph Jacobs, illustrator John D. Batten, 1892 ed.).}

^{Image "Common Core Fifth Grade CCSS.ELA-LITERACY.RL.5.3 - Compare and Contrast Two or More Characters, Settings, or Events  - Image 2" adapted from "How Sun, Moon, and Wind Went Out to Dinner" in Indian Fairy Tales (ed. Joseph Jacobs, illustrator John D. Batten, 1892 ed.).}

ne day Sun, Moon, and Wind went out to dine with their uncle and aunts Thunder and Lightning. Their mother (one of the most distant Stars you see far up in the sky) waited alone for her children's return.

Now both Sun and Wind were greedy and selfish. They enjoyed the great feast that had been prepared for them, without a thought of saving any of it to take home to their mother—but the gentle Moon did not forget her. Of every dainty dish that was brought round, she placed a small portion under one of her beautiful long finger-nails, that Star might also have a share in the treat.

On their return, their mother, who had kept watch for them all night long with her little bright eye, said, "Well, children, what have you brought home for me?" Then Sun (who was eldest) said, "I have brought nothing home for you. I went out to enjoy myself with my friends—not to fetch a dinner for my mother!" And Wind said, "Neither have I brought anything home for you, mother. You could hardly expect me to bring a collection of good things for you, when I merely went out for my own pleasure." But Moon said, "Mother, fetch a plate, see what I have brought you." And shaking her hands she showered down such a choice dinner as never was seen before.

Then Star turned to Sun and spoke thus, "Because you went out to amuse yourself with your friends, and feasted and enjoyed yourself, without any thought of your mother at home—you shall be cursed. Henceforth, your rays shall ever be hot and scorching, and shall burn all that they touch. And men shall hate you, and cover their heads when you appear."

(And that is why the Sun is so hot to this day.)

Then she turned to Wind and said, "You also who forgot your mother in the midst of your selfish pleasures—hear your doom. You shall always blow in the hot dry weather, and shall parch and shrivel all living things. And men shall detest and avoid you from this very time."

(And that is why the Wind in the hot weather is still so disagreeable.)

But to Moon she said, "Daughter, because you remembered your mother, and kept for her a share in your own enjoyment, from henceforth you shall be ever cool, and calm, and bright. No noxious glare shall accompany your pure rays, and men shall always call you 'blessed.'"

(And that is why the moon's light is so soft, and cool, and beautiful even to this day.)