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It is only in reptiles and mammals that the telencephalic roof develops
into extensive and multilayered cortices.
Although amphibians (Northcutt and Kicliter 1980) and lungfishes (Northcutt
1986) have laminated cortices, they show little migration of neurons away
from the ependyma. Birds have a small cerebral cortex, ostensibly resulting
from a secondary reduction of the reptilian pattern (Benowitz 1980).