Websites & PDFs:

• PA Invasive Plant List – excellent PDFs with pictures and alternative plants to use
• Invasive Plant Atlas
• Plant Invaders of the Mid-Atlantic Natural Areas (PDF) by National Park Service and U.S. Fish and Wildlife Service
• Urban Wildlife Podcast
• How Animal Use Smells (Thanks, Phoebe!)

Books:

• Plants of Pennsylvania: An Illustrated Manual, by Ann Fowler Rhoades and Timothy Block
• Weeds of the Northeast by Richard Uva, Joseph Neal, and Joseph DiTomaso
• Philadelphia Trees by Edward Barnard
• Kaufman Field Guide to Insects of North America by Eric R. Eaton
• Wildlife of Pennsylvania and the Northeast by Charles Fergus
• Birds of Pennsylvania Field Guide by Stan Tekiela
• Guide to the Mammals of Pennsylvania by Joseph F. Merritt
• Butterflies through Binoculars: The East by Jeffrey Glassberg
• The Kingdom of Fungi by Jens H. Petersen
• The Field Herping Guide by Mike Pingleton

Apps

• iNaturalist
• ebird
• macroinvertebrates.org
• BugGuide.net