This is the Daly Reserve twins demanding food.
The subtle change is Missy who always fed her chick before eating food herself now fills up then feeds the chick.
I explained to her she was only getting food so I could see the location and development of the chick.
The deal I explained is I give you food and you show me where your chick is. I already know where YOUR stomach is.
After months of every daylight minute spent feeding the young I think the parents slowly withdraw the service and this forces the chicks to come down to ground and learn to find their own food by watching the adults hunt.