Thinking he reserves for humans. It may be what a person does while they are tying their shoe. Although he appears to draw a line between humans and other species, he also qualifies this line of thought by honestly stating that no human really knows the answer to the question of whether some other species are capable of thought. The key thing Dennett seems to think separates us from other animals is language. This is in contrast to Fouts , Gardner, and others who seem to think that chimps are capable of language, they just aren't capable of speaking an audible language.
Language is an interesting field and study in and of itself.
Language does give humans an easier method of thinking, reasoning, and wondering about things, but if language is the only key, several interesting questions are raised. The person would not have a human-type language. When Homo sapiens became the beneficiary of this invention, the species stepped into a slingshot that has launched it far beyond all other earthly species in the power to look ahead and reflect. What is true of the species is just as true of the individual. The cause of human language ability, in Dennett's view, is our ability to 'off-load' memory.