McGraw Hill
Arthropods
Are spiders related to crabs? Study the order of arthropods with a reading selection about animal diversity. It provides details about each class within the order, as well as vivid pictures and explanatory charts.
The Franklin Institute
The Franklin Institute: Living Things Families
What do centipedes and crabs have in common? What's so special about a backbone? Check this site out from The Franklin Institute if you are interested in biology and classification.
CK-12 Foundation
Ck 12: Biology: Animals: Overview Study Guide
This comprehensive study guide covers the main terms and concepts needed for a biology unit on animals.
National Institute of Educational Technologies and Teacher Training (Spain)
Ministerio De Educacion: La Clasificacion De Los Organismo
This unit will describe the five kingdoms and their main characteristics. It includes 20 interactive activities.
PBS
Nh Pbs: Nature Works: Marbled Salamander
The marbled salamander lives in forests and woodlands in the eastern part of the United States, where it is an endangered species in certain states. Students and teachers will find the content to include a look at the species' life...