Board Thread:Suggestions/@comment-25118285-20170113233624/@comment-29659579-20170828183737

The rivers and swamps are breeding grounds for lamprey, so they could also be freshwater. Also don't get me wrong, I like your idea its just that ~90% of leeches are scavengers of inverts and amphibians, very few are actually capable of biting and the very largest species only grows to about half a block (17.2cm)