river frog
... that the call of the male river frog can be described as a "deep, low-pitched, rolling snore"?
... that the call of the male <b id="mwBig"><a href="./Lithobates_heckscheri" id="mwBik" rel="mw:WikiLink" title="Lithobates heckscheri">river frog</a></b> can be described as a "deep, low-pitched, rolling snore"?