ToL scientific content is authored by professional scientists and science educators.

• Scientific Contributions
• Scientific Contributors Log-In
• Scientific Materials Manager (log-in required)
• Browse the ToL Development Site (log-in or cookie required)
• Tools for Scientific Contributors: What's New?
• Scientific Core Contributions: Branch & Leaf Pages
  • Quickstart Tutorial: Building Your First Page
• Scientific Articles & Notes
• Tips & Guidelines for ToL Page Authors
• Tree of Life Contributors TWiki
• Scientific Contributors Registration
• Tree of Life Scientific Contributors List

ToL learning materials are provided on special pages, called treehouses, which are attached to the branches and leaves of the Tree of Life. Treehouses are authored by Treehouse Builders, who may be scientists, teachers, learners, or science enthusiasts.

• Building Treehouses
• Treehouse Builders Log-In
• Treehouse Materials Manager (log-in required)
• Treehouse Builders Toolkit
• Treehouse Contributor Registration

Images and other media are important in illustrating the diversity of life. The ToL project is accepting contributions from people who are interested in participating in the documentation of organismal diversity.

• Contributing Images and Other Media to the Tree of Life
• Media Contributors Log-In
• ToL Media Manager (log-in required)
  • Preview of the Edit Image Data Form
  • Batch Uploading Media Files (log-in required)
    • Values for ToL Image Data
    • Creating Image Batch Data XML Files Using A Text or XML Editor
• Attaching Media to a Group in the Tree of Life
• ToL Media Contributor Registration
• ToL Media Contributors List