Dorters are dormitories, so basically predorters are the place dolophins used to live. A dolophin is a drug also known as methadone, so dolophin predorters are the place where methadone was created.
It depends on which animal your talking 'bout. Platypus's use the poison in their back legs to stop predators from eating it, mollusks have shells to protect them, but as you can see, birds have found a way to weave through that ;) and so on.