Want Robins? How about other songbirds? DAHOON HOLLY (Ilex cassine) tree will entice them. Good cover for mammals and birds will nest, including mockingbirds, grackles, cardinals and others.
Flowers popular with pollinators. dioecious; make sure you have at least one male plant in the vicinity to produce berries on the females
Learn planting conditions: http://www.fnps.org/plants/plant/ilex-cassine