Some animal related words

a stag night: a social/drinking evening for groom's male friends prior to wedding (hen night = social/drinking evening for bride's female friends)
I'm having my stag night on the same day as my Sue is having her hen night.

Lion's share - The majority (most) of something (usually money)
The lion's share of her money - over 80% - went to her nephews and nieces.

 

 

fly-on-the-wall (adjective)

By using concealed cameras, fly-on-the-wall television programmes or films show people doing what they normally do every day. Big Brother is a good example of this type of reality TV programme. We use the expression fly-on-the-wall because if a fly settles on your wall at home, you do not normally notice it.