It may not be a particular bird but like the Japanese did at times ,,just a imaginary bird with no particular species !! Its a bird for arts sake only because it has a beak,feathers and wings !!
We had a roadrunner a few years back and Pedro would have been mortified at that depiction of himself !! When he built a nest on my window sill and laid two eggs we figured it wasn`t a "Pedro" but the name stuck and he/she knew it so she stayed Pedro !! She died of old age we assume,,sitting in the garage watching for field mice !!