Proboscis refers to an elongated, flexible structure often found in animals, particularly insects and some mammals, used for feeding or sensory purposes (like the nose of an animal).
The other options:
Search means to look for something.
Probe refers to exploring or examining something.
Prove means to demonstrate the truth of something.
Thus, "Snout" is the correct choice as it refers to a similar physical feature, often associated with the nose or mouth of animals.