Discovery about rat behavior is a patentable item.
Since the finding of something that already exists in nature without restriction counts as a discovery rather than an invention, it cannot be protected by a patent unless it is used in the production of a product or substance. For instance, a microorganism's simple discovery does not qualify for patent protection.
The following items are not patentable: If you were the first to discover something, like gold, it couldn't be patented. In general, unless the isolation process is sufficiently unique, microorganisms that are simply isolated from nature cannot be patented. a scientific theory, like gravity, relativity, or E=mc2!
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