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San Francisco State University: Animal Body Plans
College-level instructor's notes on how animal body plans have changed over time through the process of evolution.
Houghton Mifflin Harcourt
Houghton Mifflin Harcourt: Saxon Activity Center Real World Investigation: Symmetry Around Us [Pdf]
Use this internet lesson to explore different types of symmetry in nature. Learners examine line symmetry, rotational symmetry, and bilateral symmetry. An integrated math, language art, and art lesson. Acrobat Reader required.
Regents of the University of Michigan
Animal Diversity Web: Phylum Arthropoda
This general overview of the arthropod phylum, which includes insects and arachnids, looks at such topics as body symmetry, appendages, movement, respiratory and nervous systems, and reproduction.
University of Cambridge
University of Cambridge: Nrich: Symmetry Challenge
Sharpen your logic, symmetry, and pattern recognition skills while working on this challenge. Solution included.
University of Cambridge
University of Cambridge: Nrich: Happy Halving
On this one page website expand your logic, symmetry and pattern recognition knowledge while working on this challenge. The solution is available to double check your solution.