Novistador

A Novistador (faux Spanish for "No Sighter" or, literally "No see the man") is a large, insect-like creature encountered by Leon in Resident Evil 4. They are found in two forms at three locations within Ramon Salazar's Castle. When killed, novistadores provide "eye" stones of three colours (red, blue, and green), which can be combined with the Butterfly Lamp for greater resale value. The Eye colour depends on the "mode" the Novistador is in, for example, the default colour for the Novistador is blue, when it doesn't notice Leon, whereas the colour is green when they detect Leon, and red in the middle of attacking.

Leon encounters novistadores in the sewers below Salazar's castle. The novistadores which attack him here are flightless, but have a remarkable chameleon-like ability to blend into their surroundings almost perfectly. Fortunately, their glowing eyes, dripping acid and an outline of fog reveal their positions, allowing them to be detected if the player has a good eye, also if the player has the wii version, the aiming reticule will turn red when an invisible novistadore is targeted. The enemies attack with a series of swipes, kicks and grabs. When a Novistador grabs onto Leon, they will vomit acid over his head. If the player doesn't shake the novistador off, Leon's face will be dissolved and he will die.

Leon encounters a second breed of Novistadores in a castle tower where they have built a large hive and again in a cave system far beneath the castle. In both cases, these creatures do not have a camouflage ability but have instead gained wings to compensate. Whether these two creatures are developing stages of the same monster or different breeds entirely is never stated in game.

According to Luis's third memo, Novistadores (along with other creatures such as El Gigante) are "merely by-products of the diabolical and inhumane experiments conducted on the specimens that were once human." It is not known whether novistadores were once humans infested with Plagas or whether they are singular, plaga-like organisms.

Glitches

 * The Novistador cannot cloak and fly at the same time, but in the Nest Tower, if you look closely, you'll spot one flying while invisible. It appears only once (It will disappear the next time you play the level).