shadow

Now you know

Contrary to Internet rumors, a duck's quack does echo - but it may not echo very well. Echoes occur when sound waves reflect off hard surfaces. Higher-frequency sounds reflect best, resulting in better echoes. Depending on the species of duck, its "quack" may lack high-frequency components - so the echo may be very faint.

(c) Copyright 2001. The Christian Science Monitor

of 5 stories this month > Get unlimited stories
You've read 5 of 5 free stories

Only $1 for your first month.

Get unlimited Monitor journalism.