There are degrees of intelligence. "Sentient" might be a more appropriate word -- able to perceive, sense, be aware of other things. Many animals are sentient and I guess all (certainly most) of those are intelligent. The level of intelligence varies with the species (finding it's pinnacle in homo sapiens) and within those species some members are more intelligent than others.
Of course, there are exceptions, and the US Congressman who thought that Guam would capsize if too many people went there, half a dozen Australian politicians I could name, and the Rev. Creighton Lovelace of the Danieltown Baptist Church, seem to be wallowing in an evolutionary black hole.