It is not a mass suicide, but the result of their migratory behavior.

This migratory behavior is studied by researchers as a model of tumor cell metastasis.

To use kurjar it is important to have knowledge about the migratory behavior of the fishes.

Another challenge he overcame was the birds' natural migratory behavior.

There may be massive population irruptions, leading to migratory behaviour.

Much about their migratory behavior remains a mystery.

However, more study is needed to determine the organisms' migratory behavior.

Using telemetry methods researchers tried to explain the migratory behavior of the species.

This explains the rapid appearance of migratory behavior after the most recent glacial maximum.

Reduced migratory behavior connected with better possibilities for wintering in cities.