The White-cheeked or Bahama Pintail from the Americas (mainly Central including Caribbean islands) is distinguished from the similar,
related Red-billed Teal from Africa by:
bright white cheeks, a lot of black on the bill and light top feathers on tail. (Plumage of duck and drake is similar but drake is larger.)
Preening -- showing pintail-like neck
After preening, check look in the mirror
Normal and silver Bahama Pintails
Comparison: White-cheeked Pintail (back) with Red-billed Teal
It looks like an oak leaf to me
Silver Pintail/ Silver Bahama Pintail
Anas bahamensis fonna alba
The Silver Pintail is a colour variant of the White-cheeked Pintail (Bahama Pintail).