I'll not disagree that drinking milk is weird but I do know animals (usually ones around humans to begin with) that would disagree with you about drinking other animals milk.  At our house right now all the cats and dogs will drink milk - and choose it over water if they get a choice.  I've seen barn cats and kittens drink raw milk that the farmer squirted their way.  The bottles that zoo or rescue center animals get aren't tiger, elephant, or bear milk that someone got from another of their species...      --Kay :)