I open when the tide rises, close as it recedes, and hold tight to rocky homes against crashing waves. What am I?
Category: Animal · Difficulty: hard
Hint: Consider animals fixed to rocks that respond to water movement.
Answer
A barnacle clinging steadfastly
Explanation
Barnacles seize tightly onto rocks and open or close based on tide, with a unique timed response unlike more mobile or differently behaving shellfish.
This is a hard animal riddle — a tricky one that takes a little thought. The answer is A barnacle clinging steadfastly.
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