What kinds of animals does insular dwarfism affect and how large does an island need to be to escape it?

I've been wondering about insular dwarfism, and would like to know if it only affects certain animals (Since some animals grow larger upon colonizing an island, often due to the absence of predators.) Do only big animals get smaller, and if so, how big is "big"? Are there any taxonomic groups that are more or less prone to insular dwarfism?

The second thing that I'd like to know is the minimum size of an island without insular dwarfism could be. Also, I'm not sure if resources, biodiversity or climate affects it too (It wouldn't surprise me, or those who support Bergmann's rule.) This may sound like a lot of questions, but the main components of an answer I'd like are shown in the title - Who and Where.

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What kinds of animals does insular dwarfism affect and how large does an island need to be to escape it?

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