Migration target can be in its own area, also can adopt wide area migration according to network condition and local area load condition.

迁移目标可以在本区域内，亦可根据网络状况及本区域负载情况进行广域迁移。

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Similarly, the elimination of Sandstone Dam on the Kettle River in Minnesota opened 30 miles for fish migration and revived recreation in the area.

CNN: Study opens floodgates on dam removal

But some ranchers claim that there were indeed wolf sightings just before the reintroduction program was started, due to a small migration of wolves from Canada into the reintroduction area.

CNN: Appeal of wolf removal rescheduled

Writing in the journal Nature, the 27 scientists said the road would curtail wildebeest migration, with knock-on effects on the area's ecosystem.

BBC: Scientists urge rethink of Serengeti road plans