A southern right whale's head measures one third of its total length. It is easy to identify, as the enormous head is covered in white-coloured outgrowths of tough skin. They are only found in the oceans of the southern hemisphere.
短语 chasing your tail 的意思就是从早到晚忙个不停，但没有太多收获，就是我们常说的瞎忙活或无谓瞎忙。
I've been chasing my tail all day, but I haven't got anything done! What a waste of a day!
Organising a meeting for next week has been impossible. I've been chasing my tail trying to sort out a date, venue and agenda... I'll try again tomorrow!
短语 to run around like a headless chicken 的意思是投入大量精力去做很多事情，但是没有任何真正的收益，如汉语里常说的像无头苍蝇到处乱撞。
I've been running around like a headless chicken all day trying to get ready for my holiday, but it's already 7.30pm and I've still got loads to do!