 Animal cognition research has a particular interest in being objective, for some of the reasons reviewed in the previous two sections. Furthermore, as we saw in  section 1,  Darwin may have emphasized similarities over differences between species, suggesting a bias toward seeing other animals as like us. If humans are biased towards seeing animals as too much like humans, then some principles to protect against that bias may be needed. We see this in two classic principles used in comparative psychology: Morgan’s Canon and a prohibition against anthropomorphism.