Baby, my hummingbird friend

This is from Brazil. This little humingbird called Filhote (Baby or Young) come everyday to drink from the nectar feeder, even "sitting" in his friend finger. He also tells that Baby was introduced by his mother, one day she came, show him the man's window, then left. Since then, they are close friends. Baby comes several times during the day and calls the man to open the window.