Arachnid With a Sting in Its Tail
Puzzle 4 of Predators Hard Pack
Question is: Arachnid With a Sting in Its Tail
and the answer is: SCORPION
Word Meaning:
SCORPION — Any of the order Scorpiones of arachnids related to spiders, characterised by two large front pincers and a curved tail with a venomous sting at the end.
Definitions from Wiktionary.