The migration also attracts predators , both of the human and animal variety . Animals migrate to breed , feed , mate , and various other means to survival . Sometimes , migrations attract predators , as with the sardine run in South Africa . Some communities , like in Garden Grove , California , impose fines on anyone disrupting the local fauna . People on Christmas Island kickback with a beer during the annual crab hunt .
Animals migrate to breed , feed , mate , and various other means to survival . Sometimes , migrations attract predators , as with the sardine run in South Africa . Some communities , like in Garden Grove , California , impose fines on anyone disrupting the local fauna . People on Christmas Island kickback with a beer during the annual crab hunt .