1

I don't think that first one is a duck. Ducks can't perch on an edge like that. Their feet can't hang on.

I think it's a pigeon.

2

Also, ducks aren't colored like that. They don't have light breasts.

3 Ducks can't perch on an edge like that. Their feet can't hang on.

Which is why there's no such thing as a "perching duck", right, Steven?  And pigeons don't sleep that way.  Ducks, however, do.

As far as coloration goes, the male mandarin duck has a white underbelly and breast.  While I can't find an exact match to the one above, I think it's pretty clearly a generic (real) female duck, done anime style.  Ducks Unlimited ain't gonna scream about it.

4 Japanese species often have unexpected colors, as I learned on the example of wagtail.

BTW, do you guys remember the duck in Binchou-tan?

5 I've seen pictures, though I've never seen the series.  It's pretty clearly a mallard, though.