Of course, common sense tells you that it's snake. But do you know any other animals that can also detect infrared rays?
For warm-blooded animals such as mammals and birds, they could release heat and cannot see the infrared light. While some cold-blooded animals have the ability to see the infrared light.
The snake family known as pit vipers, including pythons, boas, and rattlesnakes, have the ability to sense the infrared ray due to pits lined with heat sensors on their upper and lower jaws.
Some fish such as goldfish, salmon have an enzyme that can switch their visual systems to activate infrared seeing. What’s more, for the goldfish, it is the only one animal that can see both infrared and ultraviolet light.
The bullfrogs could see infrared light by using an enzyme to enhance their infrared vision. Also, their infrared seeing ability could adapt according to the environment.