Amphibians as a group are an ancient class of vertebrates. As a matter of fact, they were the first group of vertebrates to master living on the land hundreds of millions of years ago. Explore the wet and wild world of amphibians!

The seashore is a great place to play and learn about science! Did you know that there many kinds of beaches? Did you know that some beaches are better than others for collecting shells? Did you know that some beaches are black or green? Grab your pails and shovels as HLN heads to the beach for some fun information about the many things you can find at the beach!

About 10,000 species of birds live in the world; about 2,000 of those species can be found in North America. Take flight with these lesson plans!

Move with us from the microscopic to the macroscopic scale in our investigation of the human body. We start out at the cellular level and move our way up in scale through tissues to organs and systems. Round out the lessons with a look at keeping the whole body healthy!

Are insects driving you buggy? Scientists say that, at any given time, about 10 quintillion insects inhabit Earth. Why not take some time, as summer days -- and swarms of insects descend upon us -- to introduce your children to these tiny animals, and to the effects, both good and bad, that they have on the other 5 percent of Earth's creatures?

Butterflies and moths are members of the same order of insects, Lepidoptera. Together they make up the second largest order of insects. There are many different families of butterflies and moths. Come join us at HLN as we explore the fascinating, mysterious world of butterflies.

Deserts are suspended in harsh extremes of heat and aridity, making them one of the most fragile ecosystems on the planet! Explore the desert biome as we trek through the deserts of the world and discover what life is like in this stark environment.

The ecosystems of estuaries, the places where rivers meet oceans, are some of the most biologically productive natural environments in the world. Many are being threatened by pollution and human development. Learn more about these ecosystems so that you can help to develop ways to protect them.

Forest biomes contain thousands of species of animals—they have been revered and respected for years, yet they have also been abused and destroyed. In this cross curricula unit, HLN explores our forests.

Did you know that gardening has been around for almost 11,000 years? The first garden art was probably decorated grape arbors. The Egyptians were the first to make paper from papyrus. Gardening goes back to the beginnings of civilization! Come join us for a closer look at gardening in this cross-curricular unit!

How does the heart work? How can we keep our hearts healthy and strong? Join HLN for a series of lesson plans that looks at mechanics of the heart and how to strengthen this vital organ!

Do you know why spiders are called arachnids? Have you ever wondered why they don't get caught in their own webs? Join us as we look at the creepy crawly world of the insects of North America!

Mammals are found everywhere in North America. They live on land and -- like the lowly mole -- under the land. Seek out North American mammals...wherever they are ... with these lesson plans!

The phenomenon of photosynthesis has intrigued scientists since it was first recognized. The plant process of capturing the energy from sunlight to convert water and carbon dioxide into sugar has been known about for well over a century. Come join HLN to explore what we do know about the process of photosynthesis.

Come with us and explore the fascinating world of plants, the producers and providers of energy to the world's host of living organisms-humans and animals alike!

Join an adventure to explore the rainforests of the world. In this unit you will identify the regions that contain rainforests and discover the unique environmental conditions that characterize rainforests.

Reptiles have lived on Earth for more than 300 million years, and they are one of the most misunderstood -- and fascinating -- creatures alive today. Find out more about them in this unit!

The strength of the River has shaped our land. The waters carry stones from high in the source to the mouth at the sea, provides avenues for transport from distant coast to villages inland, and support the many industries and towns that develop along them. By learning about the rivers of the world you will appreciate all we can do to keep them clean and beautiful.

Vision is an important but sometimes misunderstood sense. The complex signals that form the images we see can be difficult to understand but vital to learn about. This week HLN offers a set of lessons teaching about our eyes and how to take care of them!

Water is a richly complex substance that is vital to our physical existence. Without water, life as we know it would not exist. Come with HLN and explore what makes this life-giving substance so mysterious.

Are bats really blind? Are they birds? Are all spiders poisonous? Do they have fangs? Both of these animals are significant, vital, and dynamic life forms in the earth's habitat. Join our adventure into the lives of bats and spiders!

Dinosaurs were amazing creatures. Their great size and power have brought years of entertainment and education to children and adults alike. These creatures that journeyed through the land have a lot to teach us. Join us for the dinosaur adventure of a lifetime!

Is it a bird? Is it a shark? Imagine being able to travel back over 150 million years ago to see huge sharks, birds, and whale-like creatures exploring the seas and skies of the Earth! Come and imagine the possibilities!

Did you know that pictures of dolphins have been traced back to 1500BC? Even Aristotle told stories about dolphins and their interaction with humans! Our interest and fascination with dolphins, and their smiling faces, continues today. Join HLN as we explore the many aspects of dolphins in this cross-curricular unit study!

A sure sign of seasonal change is the sighting of birds, butterflies, and other animals traveling north during migration. Your children can report sightings or check out others kid's' updates of the migrations they see, from hummingbirds to sea turtles, on various Web sites. They can explore not only how birds but also other animals-such as whales-migrate.

The Polar Regions are home to the most extreme weather conditions in the world and only a minimal number of animals can survive in such places. Come learn more about these extraordinary species and the geographical locations they live.

On TV and in the movies, sharks have gained the reputation of being very large, very mean, and very scary. In reality, of the 370 species of sharks, most never reach over five feet in size with the smallest shark species, the spiny pygmy shark, being a treacherous 7 inches in length.

Did you know that there are six main genera of sea turtles in the United States? And all of these sea turtles are either endangered or threatened?!?! Learn more about these magnificent creatures that have survived since the times of the dinosaurs and how you can help them continue to survive with us, humans.

Whales, our magnificent, glorious mammals of the sea! Humpbacks migrate thousands of miles every year from Alaska to Hawaii. Blue whales can grow to over 100 feet in length! These nurturing creatures have been in existence since the dinosaur age, yet still gracefully adorn our waters. Yet for years, man hunted and killed them nearly to extinction. Find out about whales and whaling history in this fascinating unit!

Come learn more about our fine-feathered friends. Bird watching can be fun for the whole family and an excellent learning experience for children of all ages.

The US has a vast array of environmental diversities. For National Wildlife Refuge Week and throughout the year, celebrate the many plant and wildlife refuges that help our nation's threatened and endangered species.

Good dental hygiene is essential to good overall health. Join HLN as we "brush" up on ways to help your children learn about teeth!

No lesson you can teach your children is more important than the lesson of how to live a healthy life. Today's lessons and activities present the subject of nutrition in a way your children can understand, appreciate, and incorporate into their lives today and in the future.

Fall is the season when the leaves change colors from green to shades bright red, orange and yellow. This unit's lessons will take you on a "leafy" exploration of this colorful time of year!

Join HLN as we take this opportunity to learn basic food safety tips and facts, and also about Louis Pasteur and his contributions to food safety. This unit's lessons will take you across the grades and across the curriculum!

Jacques Cousteau, probably the world's most famous oceanographer, spent his life exploring the Earth's oceans. He and his colleagues were the first to witness the incredible delicate beauty of the undersea world. Join HLN as we look at this inventor, ecologist and educator!