I don't think that amaya is making it sound like it is legal to drown or shoot an animal. It is just a reality in rural areas.
Here on the farms where I live, there is no way of knowing which farmers are quickly and quietly drowning surplus kittens in the water buckets in their barns.
The bodies are then dumped with the daily manure into the manure lagoon.
It is sickening to think about, but it is happening.
Please have pets spayed and neutered,
and wearing a collar with an ID tag.