Marshall (1942) Turdus migratorius V. de Santa Ana: Behavior, notes, song, feeding, all identical to T. migratorius. The main difference was the fact that the birds occurred in what seemed to be a breeding colony. They were actually breeding and the pairs were crowded much closer together than you would ever find T. migratorius could hardly be even territories here. Were they together and limited to this one spot because of peculiarity of habitat requirements satisfied time only or because really a local and colonizing bird? Evidence from Los Essimiles indicates (occurrence only in one colony there where orchard trees & bare ground or short grass - not unique habitat) colony. At Santa Ana, any other suitable habitat would also be around habilitations, + clearings of would be recent & not stable i: could be limited to summit by necessity, not settling colonial instinct. Small trees - bare ground. ??