It is known that droughts have large impacts on many of the forests of Central America, and the timing and severity of drought is often the strongest climatic influence on the ecology of tropical moist forests. Mike Hulme and Nicola Sheard of the Climatic Research Unit at the University of East Anglia say that “climate change may already be altering the ecology of the Monteverde cloud forest in Costa Rica. This tropical forest environment, reaching up to 1500m above sea-level, relies on low-hanging clouds for delivering much of the moisture the forest needs during the January-April dry season. An increasing number of ‘dry days’ since the 1970s has reduced the mist frequency in this montane forest, a trend which has been compounded by increased temperatures, especially during night-hours. These climate changes have restricted the habitat for many of the 50 montane frog species that used to inhabit this forest.