Night-time in the forest and I’m surrounded by the squawks, rattles and chirrups of the jungle.
My heart is pumping as my torchlight scans the mass of foliage, then the beam descends on the red and purple sheen of the strawberry poison-dart frog.
So toxic are its skin secretions that it could kill a human — yet here it is, just a yard away.
Walk on the wild side: Sian Boyle goes on a tour of Costa Rica, a country