Description
What our Animal Life Cycles lesson plan includes
Lesson Objectives and Overview: Animal Life Cycles introduces students to the process by which various animals grow. Students will discover that some steps among various life cycles are similar. They will also learn about the stages that are unique to a specific animal or life cycle. This lesson is for students in 4th grade, 5th grade, and 6th grade.
Classroom Procedure
Every lesson plan provides you with a classroom procedure page that outlines a step-by-step guide to follow. You do not have to follow the guide exactly. The guide helps you organize the lesson and details when to hand out worksheets. It also lists information in the yellow box that you might find useful. You will find the lesson objectives, state standards, and number of class sessions the lesson should take to complete in this area. In addition, it describes the supplies you will need as well as what and how you need to prepare beforehand. For this lesson, you will need construction paper. Students will also need internet access for a portion of the lesson.
Options for Lesson
You will find several suggestions for additional ideas and activities in the “Options for Lesson” section of the classroom procedure page. One thing you can do is have students work in pairs or groups for the activity rather than alone. As another activity, students in small groups could create more in-depth reports on a specific animal and its life cycle. They could include one large picture of the animal and present the report to the class. Another option is to have students create one or more poems for each of the life cycles, explaining the different steps and including other pertinent information for the readers. One more idea is for students to research the timeline of various animals from egg to birth. They could create a graph that displays the differences and analyze the information, comparing it to life expectancy data.
Teacher Notes
The teacher notes page provides an extra paragraph of information to help guide the lesson and remind you what to focus on. The blank lines on this page are available for you to write out thoughts and ideas you have as you prepare the lesson.
ANIMAL LIFE CYCLES LESSON PLAN CONTENT PAGES
Animal Life Cycles
The Animal Life Cycles lesson plan contains a total of four content pages. All animals are born, live their lives, and die. It is the simple life cycle of all living things, both animals and plants. The animal life cycle leads to the reproduction of new animals, and the process is continuous. As some animals die, other animals are born. In most cases, new animals reproduce faster than their rate of death. For example, about 360,000 new babies are born every day, but only about half that number of humans dies each day. In short, for every one human who dies, two new humans are born.
The birth and death rates for other animal species vary, but all animals experience an animal life cycle. Animals are born, become adults, reproduce, and then die. However, those simple stages may vary depending on the animal species. Some animals hatch from eggs, and some come into the world directly from their mother. Others undergo special changes during their life cycle. The way an animal changes is part of its life cycle.
A life cycle describes all the stages an organism goes through from birth to death, and how that cycle continues as new organisms develop and grow. The life cycle of an individual organism may end, but because of reproduction, the species continues to live.
There are different ways animals change during a life cycle. Some animals are born looking like the parents, others do not look like the parent at all. While some change color or shape, others grow new structures. The life cycles of different animals include metamorphosis, egg laying, and live births.
Metamorphosis Life Cycle
There are about 900,000 different kinds of living insects, and they represent about 80% of the world’s species. They are the most diverse group of organisms in the world. They all go through a life cycle called metamorphosis. Metamorphosis is the process of changing from an immature form to an adult form in more than two stages. About 90% of all insects go through a four-stage life cycle called complete metamorphosis. The other 10% of insects go through a three-stage incomplete metamorphosis.
The lesson uses the butterfly as an example to illustrate a four-stage complete metamorphosis. The first stage is egg. This is the unborn stage that involves a female laying an egg. The next is larva, which is the young stage. Feeding takes place during this stage, leading to the pupa stage. The pupa is an inactive stage during which the organism is growing and camouflaged. Finally, the adult stage involves breeding, and some insects will grow wings.
During incomplete metamorphosis, there are just three stages. One of those is the nymph stage, which is the second of the three. Most of the feeding takes place during this stage. Dragonflies, grasshoppers, and cockroaches are examples of insects that develop during incomplete metamorphosis.
Some amphibians also go through metamorphosis. The lesson uses the example of a frog. The first stage, like with insects, is the egg stage stage during which the male fertilizes the eggs in jelly-like fluid. Tadpole is the next stage. First, tadpoles develop inside the egg. The outer part breaks open so the tadpole can swim out. Next, they become a froglet, which is when the body begins to change and prepares for life outside the water. Finally, the adult frog loses its tail and can live out of water.
Egg-laying Life Cycle
The next type of life cycle is egg-laying. Many animals lay eggs, including fish, reptiles, and birds. The young hatch and begin to simply grow larger without many changes. They do not generally change color or lose or gain body parts as species do during metamorphosis. There are three simple steps in the egg-laying animal life cycle. The lesson uses the example of a chicken to illustrate this point.
The size of the egg will vary depending on the animal species. Ostrich eggs are the largest in the world, but other eggs are very small. Some eggs will not survive long enough to hatch because they can be eaten as food for other animals. This is especially true when it comes to fish eggs.
Speaking of fish, the life cycle of a fish includes four stages: egg, larva, juvenile fish, adult fish. Eggs are laid in the thousands. They eventually become larvae, spending large amounts of time growing and often getting eaten by predators. Survivors become juvenile fish, which are sometimes called fry, and continue to grow. Finally, they become adult fish that lay or fertilize eggs, and the fish life cycle begins again.
Live Birth Life Cycle
The third animal life cycle involves live births. Nearly all mammals go through a live birth life cycle, including humans, dogs, bears, horses, and many others. These animals don’t lay eggs, lose or grow new body parts, or change much in appearance as the young grow into adulthood. Of course, the growth itself produces changes, but the change is mostly that the young get larger over time.
A live birth is the simplest of the life cycles. The young will grow slowly into an adult and inherit certain traits from the mother and father. This life cycle involves four stages—before birth, baby, child or adolescent, and adult. During the before birth stage in humans, an egg is produced inside the female animal and fertilized by the sperm of a male. The resulting embryo grows for about nine months.
The baby stage is when the offspring is born. Unlike the animals that undergo metamorphosis or egg-laying, the young must depend on the parent for care. One interesting fact is that in humans, babies have more bones than adults that eventually fuse together as they grow.
Depending on the species, the child and adolescent stage involves continued growth. Humans go through body changes such as puberty. Most mammals don’t distinguish between child and adolescent stages. For many, the young begin to care for themselves much sooner and body changes occur earlier than in humans. The last stage is adulthood during which the cycle can begin again.
ANIMAL LIFE CYCLES LESSON PLAN WORKSHEETS
The Animal Life Cycles lesson plan includes three worksheets: an activity worksheet, a practice worksheet, and a homework assignment. Each one will reinforce students’ comprehension of lesson material in different ways and help them demonstrate when they learned. Use the guidelines on the classroom procedure page to determine when to distribute each worksheet to the class.
STORY TIME ACTIVITY WORKSHEET
For the activity, students will create stories that relate to an animal’s life cycle. First, they will imagine themselves as one of the types of animals they learned about in the lesson (except human). They will write the story from the first-person perspective about the animal’s life cycle experience. In each story, students will begin as eggs and ensure they mention each subsequent stage. Throughout the story, they will include pictures they draw (or find online or elsewhere) and research more information that would be useful to the stories. The lesson provides an example to help guide students in the assignment. When they finish, you can grade them using the rubric at the bottom of the worksheet.
ANIMAL LIFE CYCLES PRACTICE WORKSHEET
The practice worksheet splits into multiple sections. The first section displays the stages of five different life cycles. Students must order the stages beginning with egg as 1. (All the life cycles start with egg.) In the next section, students will match definitions and terms. There is a word bank for them to use to the right of the descriptions. In total, they must correctly match eight definitions and terms. Finally, the last section requires students to decide whether each of seven statements is true (T) or false (F).
MATCH THE STAGES HOMEWORK ASSIGNMENT
For the homework assignment, students will match the stages of four different animal life cycles to the correct descriptions. The cycles include butterfly, fish, frog, and human. Students will use the word banks specific to each group of descriptions. In total, there are 17 descriptions and stages to match.
Worksheet Answer Keys
There are answer keys for the practice and homework worksheets at the end of this lesson plan. Correct answers are in red to make it easy for you to compare to students’ work. If you choose to administer the lesson pages to your students via PDF, you will need to save a new file that omits these pages. Otherwise, you can simply print out the applicable pages and keep these as reference for yourself when grading assignments.
