Good points. And now that I think about it, mice are tiny. Compared to even a petite Cornish game hen.
I read an interview with the company founder, who said that mice are a surprisingly expensive ingredient – much more expensive than the usual chicken etc.
Because my cat had pancreatitis, which, according to the veterinary nutritionist I consulted, is usually due to a food allergen, and usually chicken, I am only feeding my cat the mouse/rabbit combo.
Interesting, I would have thought that the breeding rate and hardiness of mice would make them a relative cheap and sustainable protein source. Maybe the processing of them is hard since they are so small?