9. The differences in feeding preferences lead, in turn, to differences in migratory habits. (1) The wildebeests follow, in their migration, the pattern of local rainfall. (2) The other species do likewise. (3) But when a new area is fueled by rain, the mammals migrate toward it in a set order to exploit it. (4) The larger, less fastidious feeders, the zebras, move in first; the choosier, smaller wildebeests come later; and the smallest species of all, Thomson's gazelle, arrives last. -- Where should this sentence best fit: "The sequence in which they migrate correlates with their body size."