Have you ever wondered how cats purr or why?
The original function of purring was to enable a kitten to communicate with his mother that things are well. A kitten is able to purr by the second day of life, and although he can’t meow and nurse at the same time, he can purr and nurse. And the mother cat often purrs back, probably to reassure the kitty.
There are many theories to explain how the purr is generated. One study determined that purring involves the activation of nerves within the voice box. These nerve signals cause the vocal cords to vibrate while the diaphragm serves as a piston pump, pushing air in and out of the vibrating cords, thus creating a musical hum. Some believe that purring is initiated from within the central nervous system and is a voluntary act. In other words, cats purr only when they want to.
Purring is an integral part of the feline communication system and occurs for a variety of reasons. It is classified with the “murmur vocalization” group, which involves sounds produced by a cat while the mouth is closed. In addition to purring, this group of sounds includes grunting, calling and acknowledgment murmurs. Domestic cats and some wild cats, such as pumas and mountain lions (almost any big cat that cannot roar), are all able to purr.
As the cat matures, the meaning of the purr changes. Some cats purr to indicate contentment or pleasure, but badly frightened cats and severely ill cats also purr, and so do females while they are delivering their kittens. I will never forget in veterinary school rounds seeing a big old tom cat whose leg was severely mangled (it had to be amputated) who was purring like a cussing sailor. It is not uncommon for cats to purr when they are close to death. This final purring may indicate a state of anxiety or possibly euphoria — states that have also been described in terminally ill people.
Animal behaviorists believe that when cats purr under stressful circumstances, they are reassuring or comforting themselves, much as humans may sing to themselves or hum when they are nervous. Frightened cats may purr to communicate submissiveness or non-aggressive intentions. A feral cat may purr to signal that he will not attack and other cats need not feel threatened. Older cats may purr when they play or approach other cats, signaling that they are friendly and want to come closer.
A more recent theory about purring is that it is caused by the release of nature’s own morphine-like substances (endorphins) in the brain. Since endorphins are released under circumstances of pain and pleasure, this would explain the seemingly ambiguous expression of purring. This theory lives with a reasoning, that purring is initiated in the brain and is also compatible with the more mechanical explanations for purring, as endorphins activate one of the main action systems in the brain (so thought is translated into movement).
Whatever the explanation for purring, it seems to indicate a cat’s contentment and is associated with improvement in their times of stress. Purring is one of cat’s most endearing qualities and one I cherish, as I fall asleep with Lilly nestled by my side.
Woodson: What’s the reason that cats purr? – Farmington Daily Times
Can all cats purr?
Cats purr for all kinds of reasons, including communication and healing themselves. Cristen explains how purring works and which cats can’t do it.