Whale example for GrokSaurus
Many, especially children, would refer to a whale as a big fish. Technically this is absolutely wrong, a whale is a mammal. So in a technically oriented dictionary „fish“ would not help you to find „whale“. In real world dictionary many common misconceptions are somewhat fixed, by adding some reference to „whale“ into the „fish“-article ( ... and unlike other swimming animals, (e.g. -->whales, -->penguins, -->ducks) fish do not have to ... ).
If there was a BioGrokSaurus, in a perfect world you would get the following answer to „fish“,sufficient to decide if a link will most likely lead into interesting or useless areas:
maybe you meant „whale“, that is a big animal with a fish-like shape, but it is a mammal; [whale-link]
perhaps you wanted to refer to the process of filtering swimming animals out of the sea with a net? Try [filtering-link]; or in a related meaning, do you want to find something? [search-link]
there is a screensaver that draws fish and other creatures onto the screen after extended periods of no user activity [screensaver-link]
there is a category of animals called „fish“, it is the usual usage of „fish“; [fish-link]