It is also important to know that it is much more difficult to prove a hypothesis than it may seem. My evolutionary biology professor said for example that our understanding of ears would indicate that bats have large ears to facilitate better hearing. While that is logical, you have to prove it. This is because what is logical is not always true. For example there is a species of ants that live in some kind of berry bush. Many of them has large butts that look identical to the berries. Logic would say this is to blend in with their enviorment but it turns out that isn't true. The ants with the "berry butts" are infected with a parasite. The parasite must go through ants and birds to complete its life cycle. Birds that eat the berries mistake the ants for food and eat them and the parasite. Then they poop on the bush, the ants eat the waste and the parasite enters the ant's system. It may be that the anatomy of a snake brain is different from ours and logically this should indicate they can't feel emotion. But they do express personality (damage to the human prefrontal cortex can change personality). I also don't know how much research has really gone into snake brains. My personal experience (though not statistically valid) indicates snakes (at least some snakes) seem content with their owners and some don't. They certainly can develop trust.
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