Best of Natural History Radio Folgen

Seeing a flock of black and white striped, powder puff pink flanked long-tailed tits bouncing through the grey and brown winter landscape is a cheering sight. Scruffy and bandit faced they are often heard before they are seen with piping calls to keep the flock together. Charging around in family groups these diminutive birds will spend the coldest winter nights roosting together, lined up along a branch jostling for the best position. Naturalist John Walters takes Chris Sperring to the southern fringes of Dartmoor to introduce him to one particular family group.

In the second of three programmes recorded in Iceland, wildlife sound recordist Chris Watson goes in search of Arctic Terns, which travel here from Antarctica to breed; the longest regular migration of any animal. Chris takes a 3 hour ferry journey from the mainland to the island of Grimsey which lies on the Arctic Circle to record some of these remarkable migrants. Scientists are becoming increasingly concerned about the number of breeding colonies which have failed in Iceland in the past decade and Chris hears about the reasons why and what steps need to be taken to help the situation. Producer Sarah Blunt

Each year Britain's butterflies and moths attempt to make it through the cold, dark and often wet winter months. Some species will spend the winter as eggs, others as caterpillars or pupae but some get a head start on the spring flowers by spending the winter as adults. Being at their largest and most conspicuous in a time of hunger for many insectivorous predators, is a risky strategy for butterflies. Richard Fox of butterfly conservation explains how Lepidoptera pass the winter months and takes presenter Chris Sperring to a winter hideaway for a group of adult peacock butterflies, which have some surprising strategies to keep predators at bay.