Marshall (1872) Turdus assimilis they would leak out the backs of the trees unseen & soon be heard farther uphill. The song is the best robin song of all. It includes phrases from the best migratorius songs plus mellow whistles and other phrases of the mockingbird type - but uttered in separate phrases like regular robin song. Remarkably powerful song - none of the notes are muffled as in T. migratorius, each of great beauty and of deliberate tempo. A scale of Turdus songs might be erected thus: I. plebejus humming like English Sparrow-monoronus I. migratorius & T. rubritaque, a little less hurried, moving between phrases, more musical, and less monotonous, not full toned. T. grayi : takes its time, variety, beaty good full tone. Strictly a T. mig. type though, no "tricklingbird" T. assimilis Deliberate, full, great variety but still recognizible as debel. for ever phrases of mig. song. T. infuscatus No semblence of T. mig. song, no adherence to truing of phrases; pattern like a mockingbird but much better quality and good mellow whistled phrases.