Password Snakes

The  are snakes that appeared in The Secret Life of Pets. They climb at the entrance and ask for passwords at those who need to pass them.

Appearance
The password snakes take on the appearance of ordinary bars, to fool people (or animals) trying to get in. Their eyes glow red, but when the password is correct, turn green.

Bio
There are twelve black snakes at the gate of Snowball's lair in the sewer. They disguise themselves at normal times and ask pedestrians for the password; their red eyes turn green when they get the correct answer.

However, when the snakes ask Snowball, who is just back with Max and Duke, they are attacked by Snowball and he says the leader makes up the password; the new password is "don't ask the leader for the password!" Upon hearing this, the snakes let the animals enter.

The Secret Life of Pets: Unleashed
The snakes also appear in the event added in November 2016, The Orange Throne in the mobile video game The Secret Life of Pets: Unleashed. When the mode is switching, the snakes can be seen in the beginning, and their eyes turn green before the scene is switched to Snowball's lair.