biology science fair project ideas


Biology Science Fair Project Ideas

Do you have an interest in biology? These are great biology-based science fair projects! Does alcohol or tobacco affect seed germation? Is the water in an day-old water bottle safe? How many teeth does sand dollars have? These are all questions that make for great biology science fair projects! Each science fair project includes 15 pages of easy-to-follow directions to help you create your project step-by-step.

Also included in each project:

  • Details about the scientific method
  • List of needed materials
  • Vital information on how to make your presentation
  • Details about "What the judges are looking for"

As a bonus, every project includes 16 free original science games that you can play with all your friends!

In addition to these biology science fair ideas, you can choose from over 200 winning science fair project ideas . Every subject is covered including chemistry, physics, biology, computer and environmental sciences, and more. Choose it and print it now; start your science fair project right away!


Which public places have the most germs?
Bacteria (germs) grow on every possible surface. Which public place, touched by many human hands, has the most bacteria? A grossly enlightening science fair project. 200 more science projects here!


What is the most common feeding behavior among birds?
A great science fair project for birders and animal lovers! There are birds everywhere. Have you ever really stopped to observe their fascinating behaviors? Here's your chance to learn all about these 2 legged creatures. 200 more projects here!


Is it safe to reuse the same water bottle over and over?
An enlightening science fair project .Especially to those athletic types who are drinking water repeatedly from the same bottle. Is it safe? 200 more science projects here!


Will alcohol and tobacco have an adverse affect on seed germination?
You have heard a lot about how bad smoking and drinking can be. Now you can find out for yourself how it may affect growing things. A stunning science fair project! . 200 more science projects here!

How many teeth does a sand dollar have?
Did you know a sand dollar has teeth? What else is inside of a sand dollar? You'll learn all kinds of amazing and interesting facts about these little marine animals. A fun science fair project.  
200 more projects here!

Just for Fun Biology Facts!

Animals offer interesting biology science fair project ideas. If you are looking for biology science fair project ideas consider doing a study of an animal. Science fair project ideas involving animals include studying the behavior of animals. If you need biology science fair projects, observing feeding habits offer more free science fair project ideas.

Marsupials — Life in a Pouch
Marsupials also have tiny, undeveloped young, but they grow inside the mother’s body instead of in an egg. When they are born, they climb up the mother’s fur to a pouch on her belly and settle inside. They latch onto a nipple and nurse almost continually until they have grown enough to emerge from the pouch. Some well-known marsupials are koalas and kangaroos.

Placental Mammals — Just Like Us!
Placental mammals are the largest group, and their young develop inside the mother’s body while attached to a placenta. This is an organ that gives them nutrients and oxygen from the mother’s blood, and it allows them to grow and develop to a more advanced stage before being born. Some examples of placental mammals are cats, bears, monkeys, and humans.

The Large and the Small
There are more than 4,000 species of mammals, which taxonomists classify into different groups based on characteristics like their body structure, the number and type of bones, and the number and arrangement of teeth. The smallest mammal is the Kitti’s hog-nosed bat Craseonycteridae thonglongyai, which only weighs 0.05 ounces (1.4 grams), and the largest is the blue whale Balaenoptera musculus, which can be 100 feet long (30.5 meters) and weigh 150 tons (136 metric tonnes). The largest land mammal is the male African elephant, which can reach 10.5 feet (3.2 meters) at the shoulder and weigh up to 15,000 pounds (6,810 kilograms).

What’s In a Name?
“Hippopotamus” comes from a Greek word meaning “water or river horse.” But hippos are not related to horses at all—in fact, their closest living relative is the pig!

The Large and the Small of It
Common hippos Hippopotamus amphibius are the third heaviest land mammals on Earth (after the elephant and rhinoceros), and much bigger than the pygmy hippos Hexaprotodon liberiensis. There are several other differences between common and pygmy hippos, such as the pygmy hippo’s relatively longer limbs and the fact that it is less adapted for living in water than its huge cousin. Common hippos have webbing between their toes, which aids in their dog paddle swimming style. Pygmy hippos are also much rarer, found only in the interior forests of small parts of Africa, and little is known of their habits.

Come On In, the Water’s Fine!
With its eyes, ears, and nostrils on the top of the head and nose, the hippo can hear, see, and breathe while most of its body is underwater. Surprisingly, however, hippos cannot swim! Their bodies are far too dense to even float, so they move around by pushing off from the riverbed or simply walking along the bottom in a slow-motion gallop, lightly touching the bottom with their toes like aquatic ballet dancers.

Nighttime Is the Right Time
During daylight hours, the common hippo spends almost all its time wallowing in shallow water. In the evenings, after the hot sun has set, common hippos come out of the water for a night of grazing—in fact, this goes on for about six hours! A single hippo can eat up to 100 pounds (45 kilograms) of grass in a single night, returning to the water before sunrise. While hippos like to feed on patches of short grasses (called “hippo lawns”) close to water, sometimes they must travel several miles (kilometers) to find food, making long trips on land to new lakes or rivers. At the San Diego Zoo, the hippos are fed herbivore pellets, alfalfa and Bermuda hay, lettuce, and on special occasions, melons.

Baby, You’re the Greatest!
Pregnant females actually separate themselves from the herd as the time of birth nears. Typically, common hippo calves are born underwater. They must quickly swim to the top to catch their first breath, close their nostrils as their parents do, and then submerge to nurse. Yet it is not quite as difficult as it might seem: hippo calves are able to do all this only minutes after birth.

What’s that I “Herd”?
Common river hippos live in herds of about 10 to 30 animals, but they have been observed in groups as large as 100. The dominant male has the right to mate with all females in his herd, although he will sometimes allow subordinate males in and around his territory to mate. His territory is also well marked with dung, and this effective scent mark warns other mature males to stay out. If a fight between rival males develops, hippos are capable of injuring each other with their long canine tusks, and they have been known to die as a result of a very aggressive battle.

Pygmy hippos tend to be solitary. However, sometimes the home ranges of several animals will overlap.

What's in a Name?
Rhinoceroses get their name from their most famous feature: their horns. The word rhinoceros comes from the Greek rhino (nose) and ceros (horn). For ages, rhino horn has been used to treat illnesses, especially fevers. Yet like our fingernails and hair, rhino horn is made of keratin and has no healing properties. In some countries, rhinos are being dehorned, a process that removes the valuable horn but leaves the animal alive and well. This prevents poachers from killing rhinos for the money their horns would bring.

The five types of rhinos are the Sumatran, Javan, black, white, and Indian rhinos. Javan and Indian rhinos have only one horn, while Sumatran, black, and white rhinos have two. What they all have in common are large heads, broad chests, thick legs, poor eyesight, excellent hearing, and a fondness for rolling in the mud. Because they are very nearsighted, they often charge when they are startled. This has given them an undeserved reputation for having a bad temper. All rhinos are herbivores, eating grasses or leaves, depending on the species. At the San Diego Zoo's Wild Animal Park, the rhinos are fed hay and high-fiber biscuits, along with carrots and apples.

African Rhinos: Black and White
Black rhinos Diceros bicornis and white rhinos Ceratotherium simum are the same color—they're both brownish gray! How the white rhino came to be called “white” is uncertain. One account says that South Africa's early Boer settlers called it wijde, Dutch for “wide,” which could refer to the wide lip or the size of the animal. The wide mouth of the white rhino is perfect for grazing on grasses, while the more narrow, prehensile lip of the black rhino is great for pulling leaves and shrubs into its mouth. Other names used for these two rhinos are “broad-lipped” and "hook-lipped." Guess which name belongs to which rhino!

Indian rhinoceros

Sumatran rhinoceros

Meet the Asian Rhinos
Indian rhinoceros Rhinoceros unicornis— The mouth of the Indian rhino looks like a cross between broad-lipped and hook-lipped. Although it is fairly broad, it has a small prehensile lip. Many people describe these rhinos as armor-plated, but they are actually covered with a layer of skin that has many folds. Also called the greater one-horned rhino, they are native to swampy areas of Northeast India and Nepal.

Javan rhinoceros Rhinoceros sondaicus— Like the Indian rhino, the Javan has a single horn. It is also called the lesser one-horned rhino. Javan rhinos are very rare in the heavily forested areas of Southeast Asia, and they are probably the rarest of the rhino species. Scientists have devised an interesting way of counting them. Throughout the rain forest, they have set up cameras with sensors. When the rhinos pass the sensor, the camera takes their picture! The scientists can then count them. Learning more about these jungle rhinos in the wild will help protect them from becoming extinct.

Sumatran rhinoceros Dicerorhinus sumatrensis— This is the smallest and hairiest of the rhinos. It is also one of the most endangered. Very little of its native habitat is left on the island of Sumatra. There has been little success in breeding this species in zoos.

Helping Rhinos
The Wild Animal Park has the most successful captive breeding program for rhinos anywhere in the world. When the worldwide population of southern white rhinos numbered less than 2,000, a male at the Park sired 50 babies! Many black and Indian rhinos have been born here, too.

The first black rhino born at the San Diego Zoo was named Werikhe in honor of Michael Werikhe, “the rhino man.” Mr. Werikhe was a Kenyan conservationist known for his long "rhino walks” to educate people about the plight of the rhino and to raise money to support rhino reserves. He is a good example of what one person can do to make a difference! And because all rhino species are now endangered, they need our help to survive.

Baby, It’s Cold Outside!
Polar bears live on ice and snow, but that’s not a problem—these bears have some cool ways to stay warm!

Hair— A dense, thick undercoat of fur is protected by an outer coat of long guard hairs that stick together when wet, forming a waterproof barrier to keep them dry. Even though polar bears look white, their hair is really made of clear, hollow tubes filled with air. This hollow hair helps direct the sunlight to the bear’s black skin, acting like a solar heat collector.

Blubber— Blubber helps insulate polar bears from the freezing air and cold water, and acts as a nutritional reserve when food can’t be found. This blubber also helps the bears float in the water. It is 2 to 4 inches (5 to 10 centimeters) thick.

Winter Sleep— When the temperature outside drops, many bears stay warm by making a den and sleeping. Polar bears do not hibernate, but their body functions do slow down at this time. Many scientists call this “winter sleep,” because the bears can easily be awakened. A mother polar bear can give birth and nurse her young while still in her winter sleep.

What’s on the Menu?
Polar bears are mainly meat eaters, and their favorite food is seal. They will also eat walrus, fish, caribou, beached whales, grass, and seaweed. Polar bears are patient hunters, staying motionless for hours above a seal's breathing hole in the ice, just waiting for a seal to pop up.

Unfortunately, many bears have learned to eat at garbage dumps. They could be injured or poisoned by trash, and it puts the bears in close contact with humans. This can be a dangerous situation for both humans and bears!

Polar bears at the San Diego Zoo get a ground-meat diet made for carnivores, dog kibble, trout and other fish, as well as root vegetables and lettuce. Cow femur bones and thawed rabbits are added once or twice per week.

Noses with Legs
The polar bear's nose is so powerful it can smell a seal on the ice 20 miles (32 kilometers) away, sniff out a seal's den that has been covered with snow, and even find a seal's air hole in the ice up to one mile (1.6 kilometers) away. No wonder many people call them "noses with legs!"

Den Mothers and Cubs
For such a big animal they sure start out small! A cub is about the size of a rat when it is born. The mother bear digs a cozy den in the snow to have her cubs. The den is no bigger than a telephone booth, but it can be about 40 degrees warmer in there. Usually two cubs are born to each mother between December and January. They are hairless and blind at birth, and depend on their mother to keep them warm and fed.

Milk from polar bear mothers is 35 percent fat, the richest milk of any bear species. This helps the cubs grow quickly, and by April they weigh more than 20 pounds (9 kilograms) and start exploring with their mother outside the den. At about two years of age they are ready to be on their own.

Who's the Biggest?
Both polar bears and brown bears are big, and are the largest land carnivores. But most experts agree that polar bears are the tallest bears, getting up to 10 feet (3 meters) long.

What About the Future?
For a while, polar bears were in trouble. People killed them just for trophies, and they were losing some of their wild places to live as people started moving into their territory. Global warming has affected polar bears as well, as ice sheets are melting, preventing the bears from traveling in search of food. Many countries got together to help this magnificent bear by preserving its habitat and setting up hunting restrictions. Polar bears are doing better now, but still need our help. People must continue to give these bears large, safe places to live, and try to keep the environment clean and free of pesticides that could poison the bear's food.

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