The mallard ducklings are probably not pure mallard ducklings. The female mallard probably mated with a pekin duck, which are the big white ducks, Pekins are yellow as ducklings.
All ducks that will grow-up white will start life as yellow ducklings. The beak colour depends on the breed.
They both are ducks but may be different species. if they are not the same species then they are not capable of having offspring.
Pekin Ducks
that's normal
Because ducklings are yellow. So rubber ducks are as close to the real thing as possible, apart from the rubber and the plastic squeaker.Most rubber ducks are much different from actual ducks because their eyes are more bulgy and their more yellow than baby ducks.
Yes, it came in a yellow box and was like turtles candy available now
it depends on the breed of duck they can be yellow, white, brown practically any colour
Nothing,is normal, she is in heat....will come and go....until she is bred....no worries!
Usually that is fat. Feel it. If it puts a greasy residue on your fingers, that is what it is.
Ducklings become fethered at about 6 weeks old, they begin to quack around 4 months old, and females lay eggs at 8 months old (around this time ducks become sexually active).
=NO=
No it is not.