Just curious about animation choices

So I know that this may seem really weird, and perhaps picky by me, but just to clarify, I´m not complaining, Im just Curious.

So I was fooling around with the game, and when I released a Carnotaurus, I noticed its tail stood still as if it was hard as a log when hes moving.
Initially i thought it was a bug but till now, I cannot see any movement regarding his tail.

So just confirm and out of curiosity, is this a personal choice from frontier animators or is it really a bug im seeing??
 
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