It seems plausible that this divine intervention was, in fact, the beginning of the migratory instinct in the animal kingdom.

The author fills in the blanks, with surprising revelations about eels' prodigious migratory instincts and human efforts to hunt them down.

It is not a mass suicide as was previously and naively thought, but a migratory instinct which includes a specific geographical map.

But the migratory instinct and the geographical pattern seems so deeply etched into their inward mental fabric that their pre-programmed habit rules the day.

An Emlen funnel is a bird cage shaped like an inverted cone, used to study bird behaviour, in particular birds' migratory instincts.

If the tradition of grouchy tourism is as old as the migratory instinct, two of the season's books suggest newer approaches to travel writing.

He succeeded in curbing the migratory instinct in young birds and persuaded the government of France to conduct initial testing, but stalled further experimentation.

Unfortunately, on Long Island, the distance from sea to shining sea is only about 15 miles, so the migratory instinct is seriously cramped.

They are Canadian geese, responding in a limited fashion to their annual migratory instincts.

I dug out a scraper and chipped away, cursing my migratory instincts.