This app was mentioned in 5 comments, with an average of 4.20 upvotes
Just to clarify for those who might be confused: Audubon is offering this app for FREE for a limited time only. I highly recommend this app, as do many birders I know. The app is normally $9.99.
There is an Android version available as well, check it out here.
This app is pretty handy, it has a guide and you can also use it to log your sightings and the sightings are shared with other users so everyone can see what's been going on in their areas too!
For any interested, Audubon is a great app that lets you search for birds by color, size, location and season, lets you catalog your sightinga and has the bird calls as well. Well worth the money imo /Audubon iOS Audubon Android
Here are some sites that offer some pictures to browse through. I would recommend Macaulay Library the most out of this list.
[All About Birds](www.allaboutbirds.org/guide/northern_parula)
The Android version is also FREE for a limited time. Get the Android version here.