Human and nonhuman animals alike must adjust to complex and ever-chang
ing circumstances if they are to survive and reproduce. Advanced neura
l mechanisms enable animals to remember the past, to act in the presen
t, and to plan for the future. Exploring the species generality of cog
nitive processes in behavior is central to the field of comparative co
gnition. A comparative perspective may not only broaden but also deepe
n our understanding of cognition-both in human and in nonhuman animals
.