Nature

Astronomy

• Aurora Page
• Complete Sun and Moon Data 
• Door Peninsula Astronomical Society
• Geophysical Institute - Aurora Forecast

Birds

• Birds - Cornell Lab of Ornithology
• Bird Watching
• Birdwatching  - About Wild Birds and Birding
• National Audubon Society
• Northeastern Wisconsin Audubon Society

Environment

• Borealforest
• Cofrin Center for Biodiversity
• Cystopteris fragilis, Fragile Fern, Brittle Fern, Bladder Fern, Brittle Bladder Fern, Northern Fragile Fern
• USArmy Corps of Engineers - Detroit District
• Endangered Resources Landowner Incentive Program WDNR
• Fish of Wisconsin Identification Database
• Historic lake levels
• Lake Michigan
• Michigan Sea Grant Coastwatch
• Native Plants, Natural Landscapes
• Nature Minnesota DNR
• PLANTS Database USDA
• Tides & Currents
• Wisconsin DNR-Toft Point
• Wisconsin State Herbarium

Miscellaneous

• Eagle Optics - Binoculars, Spotting Scopes, and Tripods
• GMT Greenwich Mean Time 
• Kooter's Geology Tools and Supplies
• Timeanddate.com