The rains come mostly in the afternoons but landslides and weather-related delays are most common during the summer monsoon. In late September the rains slow and autumn begins. Arguably the loveliest time of the year in Bhutan, autumn brings clear skies and warm days. Spotting unusual fauna in Bhutan is almost obligatory. Golden langur, the species of long-tailed monkey unique to Bhutan, can often be found along the central road bisecting the kingdom.
Yaks are ubiquitous as are takin on higher slopes.
The Himalayan blue sheep is common in Bhutan, as are many unusual and rare butterfly species. Throughout the centuries, the Bhutanese have treasured their natural environment and have looked upon it as the source of all life.