Called the brain worm which infects ants and an infected ant has its behavior change. The brain worm burrows into the brain of the ant ant and make solution in the brain of the ant just like a physiologist might make a lesion in the brain of an ant and causes the ants to instead of going down into the ground in the heat of the day the ant goes up grass stems to the top where it shouldnt be in the middle of the day and there it becomes vulnerable to being eaten by a sheep which is exactly what the brain worm wants because the brain worms next host after the ant is a sheep. There are lots and lots of examples of parasites manipulating their hosts for their own advantage. I want to regard every one of those changes in the host behavior as an extended phenotype. Finally, a parasite doesnt actually have to live inside its host. Cuckoos and the american equivalent of cuckoos parasitize other birds by laying eggs in the other birds nest in the cuckoo hatches out and i talk about cuckoos, euro
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