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In other words, over time, a special tanning substance accumulates in human brains, which makes the brain harder. This prevents the Animos larvae from penetrating it. At most, they can slightly nibble at the edges of the brain. (In such cases, people usually say: their brains are itching). Well, since it is well known that the Floodosaurus has a very small brain – just microscopic in size – the Animos larvae often miss and die ingloriously.