Nature on One, 7.00pm, RTÉ Radio 1. Colin Stafford Johnson is off-shore in the Hook Head area of Wexford/Waterford trying to find the second largest animal on earth, the Fin Whale. 

The presenter is on a quest with the Irish Whale and Dolphin Group, from Dunmore East, Co. Waterford, to try to find the second largest animal on earth, the Fin Whale. No less than 24 species of whales and dolphins have been recorded in Irish waters, ranging in size from the Harbour Porpoise to the Blue Whale – the largest animal that has ever lived.

Will they manage to track down what is known as the greyhound of whale species? Contributors include Padraig Whooley, Andrew Malcolm, Paddy Roche and Philip Bromwell.