One student sums up, “They all have some kind of way to rip into
meat. The eagle has the beak and claws; the snake has the teeth. All the
other yes examples have claws and sharp teeth. But the no examples
don’t have these kinds of things.” At this point, most of the class is reasonably
confident that the concept is carnivore and that the critical
attributes are eats meat and has a way to tear into meat. Carl then holds
up one final picture of a vulture, which to many students’ surprise is a no.