There's nothing more pleasant than taking a nice leisurely stroll during a hot summer day. A family of swans did just that yesterday, although their leisurely stroll through a major highway in Cardiff, Wales caused a major traffic back-up.

According to the Daily Mail, cars and trucks were halted at a standstill while the family of birds waddled across the street during morning rush hour.

"The parents were quite protective, guarding their cygnets from the passing traffic, and putting themselves between their young ones and the cars," said motorist Roger Donovan.

"Traffic was tailed back for miles."

Police later arrived at the scene in order to break-up the 'sit in' by being shooed away.