Cand one side of a duck's brain sleep while the other half remains awake?

[qazwart]

Your link…

Neils C. Rattenborg, a graduate student in the department of life sciences at Indiana State University, lined up four groups of four mallards. (Yes, he got his ducks in a row.)

Ah, but could he record their echo?

[cochrane]

I know that a male duck’s quack doesn’t echo. Mostly because male ducks don’t quack. Only female ducks do.