activity
adorable
anas
animal
background
beautiful
beauty
bird
brown
chromosomes
cold
color
color loss
cute
domestic
drake
duck
ducks
feather
female
flying
genetic
genetic changes
head
heart
little
male
mallard
mutation
nature
one
outdoor
rare
research
snow
water
waterfowl
white
white background
wild
wildlife
wing
winter
yellow