There is a chipmunk that lives in a hole close to the house. He likes to hang out on the porch.
I've been worried about him, thinking Pickles will catch him one day and that will be the end. Pickles is a stray car that came to live with me a few years ago. He's an excellent mouser. He spends his days outside and come into the house to sleep at night.
So I've noticed Pickles with a chippy several times now. I realised it's the same chipmunk that lives by the house. Pickles will catch him and carry him around in his mouth, then let him go. The chippy doesn't play dead or run off. They both just sit there, lounging about together and then the two of them will romp off again after the break.
Today I watched them for quite awhile. Pickles walking along with the chippy in his mouth. He stops and puts him down. They both sit there for a moment. Then the chippy starts running in circles followed by a somersault. He does this a few times back and forth in front of Pickles and I wonder if he's having a stroke or is fatally injured. Nope. He repeats this act with Pickles sitting there ignoring him. Chippy is trying to get his attention. Finally chippy runs over to Pickles and under his tummy, jumps up and swats him before running off for a distance then turns around, waiting for Pickles to follow. Chippy does this again and finally Pickles takes chase and off they go.
Pickles is a very good cat!!
A few weeks ago, before I realized that they were friends, I scolded Pickles when he caught the chipmunk and made him drop him. Then I tried to shoo the chippy away, to give him cover to run to safety. He just stood there and stared at me. I thought it was so odd. I was trying to rescue him but I was just interrupting their game.
Have you ever heard of such a thing???
That's astonishing!
I've heard that even brief infections of the toxoplasma gondii protozoa can cause rodents to completely lose their instinctive fear of cats.
Toxoplasmosis can affect a very wide range of warm blooded mammals (I believe around 10% of adult American humans have it, but suffer no symptoms, up to 60% infection rate in other parts of the world) so I'd be amazed if chipmunks were immune.
Toxoplasmosa gondii has a life cycle that involves cat (and other predator) faeces, and rodents, and has some amazing properties including the epigenetic remodelling (!) of neural pathways to cause various behavioural changes, chiefly the aforementioned reduction in predator aversion (rodents may also appear more playful) which increases the probability of the infected animal being eaten, therebye continuing the protozoan lifecycle in a predators intestines.
Perhaps (and this is pure speculation on my part!) your cat instinctively recognises the unusual rodent behaviour, and avoids killing the chipmunk due to the infection, but the chipmunk is encouraged to engage in 'play' behaviour with your cat by the T-G infection.
Maybe your cat is conflicted between the instincts to hunt and kill prey, and the instinct to avoid infection by the protozoa?
As far as I know toxoplasmosis is only really much of a concern to humans who have compromised immune systems or are pregnant (can cause foetal infection, pregnant women are advised to avoid cleaning cat litter trays, as that's where the T-G oocytes are found).
Acute human T-G infection can cause flu like symptons and become chronic, but my (very limited) knowledge of T-G infections in humans is that it is rare for any treatment (antibiotics, maybe specialized ones
) to be prescribed.
Livestock, and almost all warm blooded mammals are subject to possible T-G infection (I've read that infection in farmed pigs can be between 0 to 90%!) and it's fairly common to find evidence of it in other farmed meats such as goat (~50% IIRC) sheep etc.
Don't be alarmed by any of the above, as my knowledge of T-G is VERY limited and I must admit that by brief interest in it was only inspired by the death of a character in Irvine Welsh's Trainspotting novel, and Internet videos of mice with cat/rat 'best buddies'!
Do some googling if you're interested, as there's every chance I'm VERY wrong about any, or all of the above