[3] The distinct morphological differences between the subspecies have been attributed to volcanic activity on the island in the past 2.8 million years.

[4] The Gran Canaria skink has a flattened body and wide head, with strong legs that are longer in the north subspecies.

In the northeast, C. s. sexlineatus notably has a bright blue tail and light bluish belly.

It has a black dorsolaetral band, separated from the side by a whitish or yellowish line.

[2] In 2022, the IUCN Red List updated the Gran Canaria skink's status to Endangered.

As of 2021, the kingsnake had spread to 50% of the island, with Chalcides sexlineatus populations decreased in areas where the snake occurred.