When a female cat raises her hindquarters, presses her front legs flat to the ground, and deflects her tail to one side, she’s performing a hardwired mating posture called lordosis. It’s a reflexive response triggered by rising estrogen levels during heat, and it serves one specific biological purpose: positioning her body so a male cat can mount and mate successfully.
What the Lordosis Posture Looks Like
A cat in full lordosis crouches low on her front legs while arching her spine downward, lifting her rear end high. Her tail swings to one side, exposing the vulva. This isn’t something she consciously decides to do. It’s an involuntary reflex driven by hormonal changes in her brain, similar to how you might flinch when something flies toward your face. The posture is common across many mammal species, including rats and primates, and it exists because it physically aligns the female’s reproductive tract for mating.
You might notice your cat snapping into this position when you stroke her lower back or the base of her tail. That’s because tactile pressure in that area mimics the sensation of a male cat mounting, which triggers the reflex even without a male present.
The Hormones Behind the Behavior
Lordosis is controlled by estrogen. As a female cat enters heat (the estrus stage of her reproductive cycle), estrogen levels rise sharply. This hormone acts on specific circuits in the brain that prime the lordosis reflex, essentially lowering the threshold so that even light touch can set it off. Without elevated estrogen, the reflex doesn’t fire. That’s why spayed cats, whose ovaries no longer produce estrogen in cycling amounts, don’t display this behavior.
Estrus in cats lasts an average of about six days, though it can range anywhere from two to 19 days. Before true estrus begins, there’s a brief phase called proestrus that may last only a day. During proestrus, your cat might rub her head and neck on furniture and act unusually affectionate, but she won’t yet assume the lordosis position or accept a mate. Once estrus kicks in, the full suite of mating behaviors appears.
Other Heat Behaviors That Come With It
The raised-rear posture rarely shows up in isolation. Cats in heat typically display a whole cluster of behaviors that work together to attract males and signal readiness to breed.
- Loud vocalization: Persistent calling, yowling, or howling designed to attract male cats from a distance. This often intensifies at night.
- Rolling and thrashing: Your cat may throw herself on the floor, rolling back and forth in dramatic fashion.
- Restlessness and escape attempts: The drive to find a mate can make indoor cats fixate on doors and windows.
- Excessive affection: Rubbing against people, furniture, and walls far more than usual.
- Reduced appetite: Some cats eat less during estrus because their focus shifts almost entirely to mating behavior.
If your cat does mate, you’ll likely witness what’s called the “coital cry,” a sharp vocalization immediately after the male withdraws. She’ll leap away, often swatting at the male, then spend several minutes rolling on the ground and licking herself. This reaction is normal and partly caused by the male cat’s barbed anatomy, which stimulates ovulation in cats. Unlike most mammals, cats don’t ovulate on a schedule. Ovulation is triggered by the physical act of mating itself.
How Early Heat Can Start
Female kittens can enter their first heat cycle as young as four months old, though five to six months is more typical. This catches many owners off guard, because a four-month-old kitten still looks and acts like a baby. If your young cat suddenly starts yowling, assuming the lordosis posture, and trying to escape, she’s likely in heat even if she seems too young for it.
The American Animal Hospital Association recommends spaying cats by five months of age through its “Fix Felines by Five” initiative. Spaying before the first heat cycle eliminates these behaviors entirely and significantly reduces the risk of mammary cancer later in life.
Keeping Your Cat Comfortable During Heat
If your cat is currently in heat and hasn’t been spayed yet, the behavior can’t be stopped, but it can be managed. The goal is keeping her comfortable and preventing an unplanned pregnancy.
Keep her indoors and check that all doors, windows, and screens are secure. Cats in heat are remarkably motivated escape artists, and a single outdoor excursion is enough to result in pregnancy. If you have an unneutered male cat in the house, separate them completely or have one stay with a friend until the cycle passes.
Extra play sessions and interactive toys can burn off some of the restless energy. A quiet, dimly lit sleeping area with soft bedding gives her a retreat when the behavior peaks. Sticking to consistent feeding and play times helps too, since cats rely on routine for a sense of security. Some owners find that synthetic pheromone diffusers (the kind sold at pet stores for general calming) take a slight edge off the anxiety, though they won’t eliminate heat behaviors.
Warmth can also be soothing. A microwaveable heat pad or a warm towel placed in her bed gives her something to press against, which some cats find comforting during the crampy, restless phases of estrus. Gentle petting is fine, but avoid stroking her lower back if you don’t want to trigger the lordosis reflex repeatedly, as it can ramp up her frustration when there’s no mate present.