I understand that some are mad because snakes make you feel all fuzzy inside, but it's not like he was cruel to them. Everyone knows that snakes can live for over a year without food, and some have actually had snakes refuse food on their own for that long. 168 days is only half a year, so I don't really see that as being cruel since their body structure is made to function with a lack of food. As far as the blender goes, they were euthanized first, so still no cruelty there either. If his studies do end up playing a part in helping humans survive longer periods of time without dying from hunger, I'd say those snakes died for a good purpose.