My cat is acting weird. She’s standing on her rear toes with her butt in the air. What does it mean?

The exact words of the cat's owner asking for help on Reddit.com are as follows:

My cat has been acting weird. All day she’s been standing on her rear toes with her butt in the air always pointing it at me. She’s never done this before what does it mean?

I shortened them for the title. The picture accompanying the words immediately tell us what is going on.

My cat is acting weird. She’s standing on her rear toes with her butt in the air. What does it mean?. Female (queen) in heat prepared to mate. Image: u/OMGJay on Reddit.

Their female cat is in oestrus (heat) and is seeking a mate and ready to copulate. She raises her bottom slightly and places her tail to one side. The classic pose of a female cat waiting to be mated. Before doing this, she would have provided other signals to males to indicate that she was ready to mate such as rolling around flirtatiously.

Clearly, the owner has adopted this cat and unusually not had her spayed (sterilised). He/she may have rescued her informally (found her). The vast majority of people in the West i.e. Europe and America, spay and neuter their female and male cats. 

If there is a lesson here it is to check if an informally adopted female cat has been spayed. It can hard to find the scare from the operation. You might like to ask a vet.

The veterinarians say that female cats are happier when they been spayed and it helps to remove the possibility of certain diseases affecting female cats. So, it is highly recommended.

The spraying operation is more severe than the neutering operation for male cats but I argue that male cats' appearance changes when they are neutered. They become more feminised whereas for female cats there is no change in appearance. I prefer the non-neutered male cat appearance.

In the spraying surgery, the uterus, fallopian tubes and ovaries are removed. The operation prevents the queen (unsterilized female cat) from coming into oestrus and eliminates the problems of cystic ovaries, neutering infections, false pregnancies, irregular heat cycles and confinement during the mating season. 

And it also reduces the frequency of breast tumours. Spaying reduces the chances of a female cat developing mammary tumours by 90%.

Spaying does not make a cat fat and lazy. It might slow their metabolism and this can be countered by a fresh diet and some more exercise.

The best time to spay a female is at 5-7 months of age before she goes into her first heat.

Veterinarians believe that a spayed female makes an outstanding pet and she is able to devote herself exclusively to her human family. 

Plus, you don't have the risk of acquiring a bunch of kittens to care for and find homes for.

Good video of a female domestic cat in heat adopting lordosis position

Lordosis behaviour is described sensitively and respectfully 😎 by the Wikipedia authors as "the naturally occurring body posture for sexual receptivity to copulation". You can see the female raising her backside and placing her tail to one side to allow the male access for copulation.

Note about the video above. I would expect this to stop working but what will be left is a link to the Reddit.com website where you can see the video. Or it might just stop working! Sorry if that has happened but I don't control the video.

The Wikipedia authors are far more technical about the description. They say that "during lordosis, the spine curves dorsoventrally so that its apex points towards the abdomen"!

Lordosis behaviour happens when the queen (unsterilised female) is in heat otherwise known as oestrus which is spelt "estrus" in America.

It is also known as mammalian lordosis indicating that it is seen in different mammals such as hamsters, elephants and eastern grey squirrels.

It is a reflex action which is crucial to reproductive behaviour. The "lordosis reflex arc" is hardwired into the spinal cord at the level of the lumbar and sacral vertebrae. The action is moderated by the brain.

The female cries out for attention and this vocalisation is called caterwauling. My mind turns to cat breeders in keeping stud cats away from queens. And I can remember a complaint by a neighbour because the breeder's facilities were in a neighbourhood, an urban environment.

The complaint was about the noise from the breathing cats. As I recall they were Bengal cats.

The female is ready for copulation and fertilisation under the action of oestrogen in the hypothalamus resulting in an uninhibited lordosis reflex. Dramatic words.

Cruder words would be that female cats positions themselves in a way which makes it easier for male cats to have sex with them. Breeding cats are very good at procreation. Theoretically, and I stress theoretically, a single pair of breeding domestic cats could produce 65,536 cats in five years!

This assumes that all survive, and that males and females are born in equal numbers and that they all start breeding when they are a year old. Reality is different.

2 cats became 84 in 2 years (in 1 room). Image: Image: Feline Solutions Inc.

However, we do see some pretty sad pictures of goodwilled but misdirected cat hoarders allowing their cats to breed rapidly such as the 84-year-old lady living in one room with almost a hundred cats. All she had to do was sterilise the cats. She started with two, unfortunately a male and a female!

Big Cats Get More Sex

Yes, a slightly crude but also slightly eye catching title. And I must say, no surprises. In a study¹ of the "fighting ability, rank during courtship, and mating success of the male cat", the heavyweights had an advantage. In "agonistic encounters" over females in heat, heavier male cats will usually overcome lighter male cats. "Agonistic" means combative encounters or fights.

Accordingly heavier cats had greater success in mating and therefore the creation of offspring. This would seem to be a classic example of the survival of the fittest (Darwin's theory of evolution).

Cats fighting and watching - Photo by J i J y

However, when heavier males were within a feeding group other than their own they fared less well in arguments over a female. Lighter cats sometimes won. Perhaps this is because the females were less acquainted with the incoming males, were less comfortable with them and had a say in the matter.

Note: (1) Mating behaviors, courtship rank and mating success of male feral cat (Felis catus) Akihiro Yamane, Teruo Doi and Yuiti Ono.

Associated page: Cats Mating.