I've been caring for ferals for 10 years now and believe it or not, I don't know what a cat sounds or acts like when she is in heat. A new cat showed up about 6 months ago and I can't tell if it is a male or female. It tries to chase off my other ferals and lately it's been very vocal. I can't describe the noise she (?) makes but its very loud. She seems to do it whenever she sees me or another cat and will sit on my deck and look in the door and just holler away. It drives my inside cats crazy. I keep telling her if she is in heat, she's barking up the wrong tree because all of my boys are neutered. Is this the way a cat acts if they are in heat? I've tried trapping him/her a few times to get it sprayed/neutered but I haven't had any luck yet.