Ranicide

Although the bereaved family—the brothers and sisters, for anything we know to the contrary, of the ill-fated flirt who perished so suddenly in the bloom of his youth and in his opera hat—had pleaded with tears for a verdict of ranicide, and a big deodand on the ox, no honest frog could have forgotten for a moment the plain demands of duty.

At any rate, Warden Fred Hottle told Riddell—not in precisely these words—that unlicensed ranicide is illegal in Virginia.

The experimental models used included isolation and shock-induced conspecific aggression, muricide (mouse-killing), and ranicide (frog-killing).[…]In a series of experiments (8), testosterone was found to be neither an initiator nor a promoter of ranicide behavior in the adult male rat nor an inhibitor of ranicide in established killers.[…]Similarly, exogenous testosterone given to animals demonstrating ranicide on the first testing session did not increase the rate at which these animals killed frogs compared to subjects that did not receive testosterone.

McIntyre (personal communication) found no change in the mouse-killing patterns of rats post-kindling, and a more extensive study by Bawden and Racine found no changes in muricide, ranicide or intraspecific aggression of their post-kindled rats.

The review covers both offensive and defensive aggression in a variety of animal models including muricide (mouse killing), ranicide (frog killing), isolation-induced, pain-induced, brain stimulation-induced, and intermale aggression.

Ranicide in rats was found to be reduced by injection of noradrenaline into the hypothalamus, as was muricide behaviour (Bandler, 1970).[…]Other sites in the unspecified ‘ventral midbrain’ were also found (Bandler, 1971) at which noradrenaline administration in crystalline form served to facilitate predatory aggression (ranicide and muricide).

This involves the study of attacks that one species directs to a member of another species. Examples of this type include mouse killing (muricide) or frog killing (ranicide) by the rat and attacks on locusts by mice.