A fox cannot hide its tail.; Evils cannot be covered up.

狐狸尾巴藏不住。

《新英汉大辞典》

The dog ran up, wagging its tail.

那条狗摇着尾巴跑上前去。

《牛津词典》

When the bear puts his tail into the water through a hole in the ice, to try and catch a fish, the ice freezes around it, and he ends up pulling his tail off.

当熊把尾巴放到了湖面上的冰洞里面去钓鱼的时候，水在熊尾巴周围结冰了。熊使劲儿往外拔它的尾巴，结果把尾巴拔掉了。

youdao

Finally, they moved me into a pick-up truck, then the back of a tail-dragger Cessna with a couple of nurses on it and flew to Nairobi.

FORBES: Billionaire Tom Siebel Shares Chilling Elephant Attack Horror Story

So the mysterious Mr Rajoy must seek to avert twin tail-risks: the break-up of the euro zone on the rocks of Spain, and the break-up of Spain itself.

ECONOMIST: Charlemagne

Bell and Panesar combined to run out Yuvraj for 45 off 39 balls when Zaheer sent him back and Panesar then bowled the tail-ender comprehensively before Anderson cleaned up Patel to put the seal on a highly impressive victory.

BBC: Inspired England take series lead