Title says it all.
inb4Humanity
Edit: Not remove from memory; they just immediately die out.
For me, ticks. Hate those freaking things.
Edit: I swear, if one more person says spiders or snakes...
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Edited by Koldraxon: 1/10/2015 6:39:09 PM[CREATION.EXE EXCEPTION: SENTENCE MISSING FROM 10/01/2015] One species? Black Holes, if counted as a species, yes. Very small dangerous insects? Yes, if they don't ruin the ecosystems. Harmful (if violent) foreign life-forms? yes, if they want to destroy us all for a bad reason.