Marshall (1942) Turdus assimilis V. de Santa Ana: On our 2nd day of trip to summit, found another "colony" at coll. 2385. Detected by Hylo-like calls in dense vegetation along steep narrow ravine with creek in it. Many birds here & could see them often by looking into the thickets would come close to imitate notes. Sides of ravine had rather dense tree growth, a few yards away was clearing. May 2 Chilata: 2477 taken from another "colony" - only birds located or heard in entire Chilata area were in edge of a balsam grove and in adjoining ravine where there was a unique luxuriant growth. The steep hill from ravine to balsam grove had bare ground & tall snags & foliated trees. The Robins were singing from the latter snags & trees. The birds were very noisy & conspicuous, singing from bare branches in the snag & flying back & forth to the ravine.