Tonight’s Springwatch is action packed with animal behaviour and live cameras. Chris Packham and Michaela Strachan reveal some new science about toads who make a mammoth migration in spring. Iolo Williams takes a live look into the underwater world around the coast of Mull and some of the most enigmatic birds that visit the island at this time of year: puffins. Megan McCubbin looks at the wildlife success stories in Kielder Forest, including pine martens and voles, and looks forward to her onward journey exploring the wildlife wonders of the north east of England.