migratory

英['maɪgrət(ə)rɪ;maɪ'greɪt(ə)rɪ] 美['maɪɡrətɔri]

1. used of animals that move seasonally;

"migratory birds"

2. habitually moving from place to place especially in search of seasonal work;

"appalled by the social conditions of migrant life"

"migratory workers"