Alien worlds have potentially-lethal animals and plants...
...but the most dangerous creature in the Universe is...Man!
I take it back.
The most dangerous creature in the Universe is Woman!This never-reprinted tale from Ziff-Davis' Weird Thrillers #1 (1951) was probably illustrated by a round-robin of Dan & Sy Barry, Murphy Anderson, and Frank Giacoia.
The writer is unknown.