I identified a roadrunner because they are out on the somewhat rural roads where I live this time of year. I identified this bird by its size, the fact that it was "running on the road" (roadrunner), and its long tail. I did not take a photo of it.
Additionally I've been watching a blue scrub jay. It is not a blue bird, and I identified it on Merlin and in my bird book. Its larger than most birds that get on the feeder, including a bit larger than the male Northern Cardinals. I love its blue feathers, distinct from most of the birds that visit my oak grove.