How do I explain cash is preferred? Is my kitten broken? Birds, rodents and frogs were the norm from our elderly cat in her hay day, never worms. Payment was infrequent but 'standard'. Every day we are given another wriggly plump earthworm. He doesn't eat them (they are clearly only a suitable food for lesser creatures, such as humans), just dumps it in front of us and waits to be thanked. He did branch out a bit last week and mixed things up with a moth, but otherwise it's just worms...
Photo of furry overlord-in-training as tax payment.