Killing a bigger animal causes more bad karma than killing a smaller animal? I know that killing virtuous beings is a grave bad karma. But when it comes animals, virtue is irrelevant. I have heard from monks that bigger the animal greater the sin it is to kill it. How is that so? Why does physicality matter at all? Isn't it just a matter of your intention when it comes to karma?
My knowledge in Buddhism is quite poor. IMO it is a greater sin to kill a larger animal than to kill a smaller animal but this cannot be the case always! Let me ask you a question. Which is easier, to kill an ant or to kill an elephant? Generally the effort and planning you have to go through to kill an elephant is much greater than to kill an ant. The greater the effort you are willing to put is because of the greater intensity of cruelness of your mind which makes it a greater sin. True physicality isn't what determines this. Hope this answers the question