Probably something to do with global warming

From The Independent:

Basking sharks, the world's second largest fish, are thought to be mounting a recovery in UK waters following the end of commercial hunting. Sightings have not only increased over the past 20 years but the size of the individual sharks seen has also grown, a classic sign of population recovery. More than 81,000 basking sharks were caught in the North-east Atlantic from 1952 to 2004 but they are now widely protected.

Also from The Independent (spotter's badge - Bob E):

While motorists in Australia will be familiar with warnings about errant wallabies, the people of Gloucestershire are now being asked to keep their eyes peeled for the animals. In the past few days Gloucestershire Police have received a number of calls from people reporting sightings of a wallaby or kangaroo on the A40 near Highnam. The most recent report was on Monday, shortly after 10pm.