Very cute chicks! Wings and feet seem quite a bit daintier than our babies 
Thanks for the links to the pics dupre.
Ben Franklin or someone of his ilk, called the peregrine a duck hawk because of the size of their feet 
They do make the merlin chicks seem cute and dainty! 
Actually, duck hawk is the name given to the peregrine (Audubon called it the Great-footed Bird) and for exactly the reason you mentionned Moka - the big feet. Merlins are called pigeon hawks. Don't recall ever hearing if there was another name for American Kestrels ...
Interestingly (small) ducks are as big a prey as peregrines can handle and mostly they eat smaller prey. Same for the merlins, pigeons is as big as they can get, and mostly its smaller they rely on.