[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.

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

The reason for the listing is the recent introduction of the California Kingsnake, which preys upon the skink.

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