Here is the undersides of two of the warbler species and see if you can ID them:
Note: length for the undertail coverts to the tip of the tail is different length.
Swainson’s Thrush - 11
Veery - 9
Black-throated Blue Warbler - 6
Magnolia Warbler - 5
American Robin - 4
Note the complete eye ring of the Connecticut Warbler. There is no break or split at the halfway mark as you see in the Mourning Warbler eye ring.
Hatching year (immatures) Mourning Warblers have an incomplete eye ring in both sexes.
**Connecticut Warblers have shorter tail projection past their undertail coverts and Mourning Warbler has longer tail projection beyond their undertail coverts. The Connecticut Warbler is on the right and the Mourning Warbler is on the left in the picture of the undersides of the warblers seen above.
Enjoy the little intriguing things about nature!