Update to my feral cat problem... 1st up is descriptions and articles for our fellow forum member who does not understand the feral cat problem and the dangers they represent. The most balanced of these comes from the UK.
http://www.saferpets.co.uk/are-feral-cat-colonies-dangerous.html
Are feral cats dangerous?
Like all animals, feral cats can carry parasites and diseases which can be transmitted to humans, known as zoonosis. These included toxoplasmosis, giardiasis, rabies and campylobacter.
Are Feral Cats a Risk to Pets?
Again, feral cats will carry diseases and parasites which can be transmitted to pets and since they share the same anatomy as your house cat, they can be a particular risk in introducing feline diseases, such as feline leukaemia or feline immunodeficiency virus (FIV). Feral cats are particularly prone to these two diseases due to the frequent fluid exchange from constant fighting and mating. In addition, feral cats can be infested with a large numner of fleas, as well as intestinal bacteria and worms. They also often carry ear mites, ring worm and upper respiratory tract infections (e.g. cat flu). Even if they don’t come into direct contact with your pet, they may still transmit disease and parasites through their waste products, particularly if they are using your garden as a toilet!
They can also be a risk to dogs since they are likely to stand their ground and fight, thus inflicting injuries which may become infected or transmit disease. Similarly, they may encounter, fight and harm any domestic pet cats which are allowed to roam, particularly at night.
Are Feral Cats a Risk to Wildlife?
Here the answer is an unequivocal ‘yes’. Especially with island ecologies, the effect of feral cats on the local wildlife can be severe. In the UK, this may well still be tolerable as cats are an established species and do not endanger many of the native wild species but in places such as New Zealand, Australia and even parts of North America, they are regarded as a serious threat to local, endangered species. Some also worry that feral cat colonies living close to urban areas may attract other larger, more dangerous predators such as coyotes, bears, wolves, wild cats and feral dogs.
https://abcbirds.org/wp-content/uploads/2015/05/Feral-Cats-Consequences-for-Humans-and-Wildlife.pdf
http://www.animalplanet.com/pets/5-most-dangerous-cat-diseases/
A good article in the Times- Picayune - "15 reasons science says feral cats are a disaster" from 2018.
https://www.nola.com/archive/article_eb5c5aae-d596-552f-995d-6dfbe87ce68f.html
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In the last 5 days I’ve captured and relocated or otherwise removed 24 feral cats from my farm. There has been a twist… two elderly couples who live approx. 1/2 miles from me but in opposite directions.
A population of about 40-50 feral cats were using my farm as a home base while scavenging and living part time at the other 2 residences. One neighbor sits on her porch in a rocker with a .22 rifle by her side. She is a crack shot… Once she started losing bantam chickens and had her rabbit hutch broken into, she started dishing out damage. I’m not worried about her.
The other couple has health issues and is unable to do much about their loses. Once I began my campaign a dozen or so feral cats started to appear in broad daylight at their house. They have a couple of small yard dogs, both have been mauled. The one pet cat they had disappeared.
Completely removing these problem animals is going to be a bit more complicated than I thought. At least I’ve made a good start.