You are not alone when you have seen a cat freeze, then open its mouth and curl up its lips, and look like it is nearly shocked when it smells of something. This peculiarity of expression may appear comical or even somewhat frightening, yet it is really absolutely normal. They are performed by cats who are attempting to learn more about a smell. It is not dislike or perplexity; it is a biological reaction that enables them to take the additional information on the surrounding. This is mostly likely to occur when the cats are exposed to new, powerful, or captivating odors.
It is their kind of response.

That is a funny face, the flehmen response. It is used by cats to examine some smells more deeply. It is an instinct held by most animals.
They are Playing an Exclusive Organ of Sense.

The vomeronasal organ is found at the roof of the mouth of the cats. This organ assists them in the detection of chemical signals. The face is used to direct smells to this part.
It Makes them Learn about other animals.

This is something that cats like to do after smelling an animal. It assists them to amass information such as who they are or their status. There is a message that cats do not get through any other means other than smell.
They take powerful smells as an investigation.

The reaction is more probable with unfamiliar scents. The new objects, shoes and bags can trigger it. Curiosity plays a big role.
It’s Not a Sign of Disgust

The face resembles looks as ew, yet it is not. Your cat isn’t grossed out. They are merely doing information processing.
Male Cats Do It More Often

This is more exhibited by male cats. It has a connection with scent communication. The frequency of its occurrence can be affected by hormones.
They take it as an awareness.

Cats are very dependent on scent to learn about territory. This response assists them to interpret scent marks. It is an element of the way they are safe.
Kittens Can Do It Too

This behavior may be demonstrated even by young cats. It grows early when they are venturing in the world. They learn smells from tender age.
It Only Lasts a Few Seconds

After the process of information processing is completed, the face relaxes. Your cat then moves on.
It is Like Totally Natural Behavior.

When you look at it, there is nothing to be worried about. It is an indication of a healthy and alert cat. It is an indication that their senses are in good shape.
It makes cats so interesting to observe, one of the numerous subtle acts.