Mongoose
As stated in Śrīmad-Bhāgavatam(SB 1.13.47), this killing process is natural. Jīvo jīvasya jīvanam: “one animal is food for another animal.” A frog is eaten by a snake, a snake is eaten by a mongoose, and the mongoose is eaten by another animal. In this way the process of destruction goes on by the supreme will of the Lord. Although we do not see the hand of the Supreme Lord directly, we can feel the presence of that hand through the Lord’s process of destruction. We can see the clouds scattered by the wind, although we cannot see how this is being done because it is not possible to see the wind. Similarly, although we do not directly see the Supreme Personality of Godhead, we can see that He controls the process of destruction. The destructive process is going on fiercely under the control of the Lord, but the atheists cannot see it.
(SB 4.24.65)