The following text is for questions number 17 to 19!

Chameleons

    There are 80 different types of chameleons in the world, most of which are to be found in Africa, South of the Sahara desert. The common chameleon ranges from the Middle East, along the North African coast to Southern Spain.

    The chameleon is a slow-moving lizard which hunts for insects among trees and undergrowth. One of its peculiar features is its eyes, which are set in two conical sockets and can move independently of one another. This enables the chameleon to look behind with one eye and in front with the other.

    Chameleons are well-known for their ability to change color. The skin and body markings change color to match the surroundings. Among the plants, for example, the chameleon is very difficult to spot among foliage.

    When the chameleon spots an insect which it thinks would make a fine meal, it shoot out a
long, sticky tongue and draws its prey back into its mouth.

"... difficult to spot among foliage." (Paragraph 3).

The synonym of the underlined word is ____.