Well, yeah, of course we won't know as much about endangered species, or species that are remotely exotic or dangerous to deal with. But cats, dogs, rats, mice, cows, pigs, horses, frogs, (smaller) fish and sheep should be very well researched, of which the knowledge of the smaller animals should at least rival our understanding of human processes. And be it only because the only way we can test a few things is by knowing that.
Reminds me how they livestreamed the dissection of the last cat of our physiology institute. You usually never see even one lecture hall filled up, but that filled up the aula and 5 halls. The cat looked so peaceful (probably due to opium based anesthesia)
