Migratory

2 clues
Nomadic
Of birds that move seasonally
Similar answers:
Adulatory
Aleatory
Alienimmigration
Amatory
Ambulatory
Amendatory
Annualmigration
Antiimmigration
Atory
Breadatory
Cahngratulatory
Causesmigraines
Congratulatory
Conservatory
Cosignatory
Crematory
Declamatory
Defamatory
Depilatory
Derogatory