But How Does the Chick Know about Tapping Her Beak? And How Does the Mother Know About Regurgitating?
But How Did this Instinct Start? And How did it get into the Bird?
The instinct was there in the very first Herring Gull – however many millions of years ago that may be. And it was there complete and fully formed: or there would be no Herring Gulls today.
If the chick didn’t tap, it would have starved. If the mother didn’t regurgitate, again the chick would have starved. BOTH BEHAVIOURS had to appear at exactly the same time.
How did this happen?