A checklist of birds that you may find in Frick Park, P.A. developed by the Three Rivers Birding Club of Pittsburgh.
The Olive-sided Flycatcher (Contopus cooperi) is a passerine bird. It is a medium-sized tyrant flycatcher.
The Eastern Wood Pewee (Contopus virens) is a small tyrant flycatcher from North America. This bird and the Western Wood Pewee (C. sordidulus) were formerly considered to be a single species. The two species are virtually identical in appearance, and can be distinguished most easily by their calls.