4-H Embryology [ Kids/Teens/Mature Teens ] - Includes guidelines for incubating and candling eggs, photos, movies, egg cam, and resources. Sponsored by the University of Nebraska Cooperative Extension. http://lancaster.unl.edu/4h/Embryology/

Activities in Biology [ Teens/Mature Teens ] - Provides interactive quizzes on topics such as cell biology, organ systems, ecology, and photosynthesis. http://www.syvum.com/squizzes/biology/

Biology In Motion [ Teens/Mature Teens ] - Online activities for learning biology, including animated cartoons, an evolution simulation laboratory, and drag-and-drop quizzes. http://BiologyInMotion.com/

Biology Online [ Teens/Mature Teens ] - Online activities, labs and tutorials. Site available in Spanish. http://www.biology-online.org/

Biotech Adventure [ Teens/Mature Teens ] - A site intended to teach users about biology and biotechnology. Includes some educational illustrations and animations that can be downloaded by teachers and other educators for use in their curriculum. http://biotech-adventure.okstate.edu/

Common Teasers in Biology [ Kids/Teens ] - Offers a few facts such as how an insect breaths to why a chameleon can change it's color. http://www.geocities.com/mickey_prasad/bio.html

Cool Science For Curious Kids [ Kids ] - Fun and interactive site to help kids appreciate science. Why are snakes like lizards, and monkeys like moose? Find out here. http://www.hhmi.org/coolscience/

Diversity of Life Web Index [ Teens/Mature Teens ] - Links to information about each of the kingdoms and a glossary of terms. http://www.geocities.com/RainForest/6243/diversity.html

Dr. Farabee's Online Biology Book [ Teens/Mature Teens ] - Well organized and illustrated general biology text from Estrella Mountain Community College, Phoenix, Arizona. Advanced, but very clearly explained and illustrated. http://www.emc.maricopa.edu/faculty/farabee/BIOBK/BioBookTOC.html

Electronic Naturalist [ Teens/Mature Teens ] - Information on North American animals and plants with illustrations, text, activities, and access to a naturalist. http://www.enaturalist.org/

eNature.com [ Teens ] - The complete nature and wildlife resource featuring the Audubon Guides to plants and animals, outdoor planner and destination guide, habitat Guide, eCards, and newsletters. http://www.enature.com/

Fish Olympics [ Kids/Teens ] - Introduces the natural history of the sea through a fun game. http://www.liverpoolmuseums.org.uk/nof/fish/

Forest Speaks Exhibit [ Teens/Mature Teens ] - Educational web version of the Visitor's Center exhibit at the Smithsonian Tropical Research Institute in Panama. Includes information on rainforest mammals, frogs, birds and plants. http://striweb.si.edu/forest_speaks/

I Can Do That [ Kids/Teens ] - Cartoon characters take you on a tour of cells, DNA, RNA and biological techniques. http://www.eurekascience.com/ICanDoThat/index.htm

Living Things [ Teens/Mature Teens ] - A look at individual organisms, communities, populations, species, and ecological food webs. http://www.fi.edu/tfi/units/life/

National Institute of Environmental Health Sciences Kids Pages [ Kids/Teens ] - Games, music, brainteasers, and other activities that introduce children to the impact of the environment on health. http://www.niehs.nih.gov/kids/games.htm

Neuroscience for Kids [ Teens/Mature Teens ] - Text, interactive activities, games, and links about the nervous system. Users may make neuroscience postcards to send to their friends. http://faculty.washington.edu/chudler/neurok.html

OceanLink [ Kids/Teens ] - Facts, in-depth articles, ask-a-scientist forum, archive of answers and newsletter on oceans and ocean life. http://oceanlink.island.net/

Online Biology Book [ Mature Teens ] - Provides concise information on all aspects of biology, from biochemistry and body systems to plants and history. http://www.estrellamountain.edu/faculty/farabee/biobk/biobooktoc.html

Science For Kids [ Kids/Teens/Mature Teens ] - Offers news about plants, animals, and other life science issues. Also includes pop quizzes, and pictures. Site is available in Spanish. http://www.ars.usda.gov/is/kids/