Isn't "Dyr" singular?
Mono-syllable neuter nouns often stay mono-syllable in indefinite plural. Et dyr, dyret, dyr, dyrene.
And this could also mean "Many animals are eating fish"?
I said "not all animals eat fish". I guess that's incorrect?
Yes, that would be the translation of "Ikke alle dyr spiser fisk".
Its "Some animals eat fish"
I keep being thrown off by "dyr" as a false cognate of "deer"
I guess it'll get better with time though.