It was a very hot day when I visited Doi Inthanon, Thailand’s highest mountain (at 2565 metres or 8415 feet), in early May this year. Temperatures in Chiang Mai city had reached 40 deg C the day before, but it was much cooler up the mountain. There are large tracts of different types of forest on this mountain – Doi Inthanon National Park covers an area of about of about 482 square kms – but it is often shrouded in cloud near the top.

Unfortunately, the top of the mountain was rather cloudy on 7th May, so we headed further down, stopping off at a number of waterfalls, where I hoped to photograph butterflies.

One of the most beautiful falls on the mountain is Wachirathan Falls, just over 20 km into the NP, which is a magnificent spectacle, even in the dry season. Unfortunately, there were not many butterflies about, or the ones that were flying about were rather inaccessible, so I decided to head further down to the ever popular Mae Klang Waterfall. This lies just outside the boundaries of the NP, so is more heavily visited by picnickers and sightseers.

There was much less water flowing than in previous visits; compare the photograph above (taken in May, before the rains have arrived) with that taken in November (at the end of the rainy season) in a previous year.

Mae Klang waterfall is at an altitude of about 1,200 m or so, so is much hotter than further up the mountain, and there were plenty of butterflies around! The problem was that because of the high temperatures, the butterflies were flying about so fast it was very difficult to photograph them! One of the more obliging species was the Common Leopard Butterfly (Phalanta phalantha), which were present in quite large numbers along the stream beds next to the river.

The butterflies were ‘puddling’ or ‘mud-puddling’ as it is called; they are trying to absorb sodium (in the form of sodium chloride, salt) or nitrogen (in the form of amino acids) from moist substrates such as mud, animal excrement, rotting fruits, carrion, dung, bird droppings, sweat, tears and so on (See 1: See you down the puddle). Curiously, many of these Common Leopard butterflies were sucking up moisture from the rocks themselves (below). There must have been a thin layer of water on the rocks, which may have produced a solution of salts or minerals attractive to these insects.

Despite being engaged in mud- or moisture-puddling, the butterflies did not stay put for long, and usually flew off as soon as the lumbering photographer approached them! I did not manage to get as close as I would have liked, but after taking dozens of shots, I managed to get a few usable ones.

These butterflies take about three weeks to develop from egg to adult (at 28 deg C) and the larvae feed on flowering plants in the Willow family (Salicaceae) including Flacourtia inermis and Salix babylonica (Links 2 and 3).

There were also quite large numbers of yellow/green butterflies flying about, at amazing speeds! One often sees pictures of stationary butterflies, which fail to do justice to the extraordinary vitality of these insects. Butterflies can be very fast fliers – especially the nippy little Skippers, which can reach speeds of up to 60 km per hour! Skippers are shaped like little jet fighters! As the following photograph illustrates.

I did manage to grab a couple of photographs of the lively yellow/green butterflies, which turned out to be Lemon Emigrants, feeding on nectar from Lantana flowers.

I also came across this little skink – a Streamside Skink  (Sphenomorphus maculatus) – on the rocks near the waterfalls (below).

The waterfalls are a good place to cool off on a hot day, and people like to sit and relax on the rocks beside the streams. There are plenty of small restaurants and vendors nearby providing food and snacks for visitors.

So even when temperatures are unbearably hot, there are many places to go to chill out, whether you are a butterfly, skink or primate!

1. https://rcannon992.com/2016/03/10/see-you-down-the-puddle-puddling-in-butterflies/
2. Rayalu, M. B., Kumari, V. K., Naidu, M. T., & Atluri, J. B. (2014). Life history and larval performance of the Common Leopard butterfly, Phalanta phalantha Drury (Lepidoptera: Rhopalocera: Nymphalidae). International Journal of Advanced Research in Science and Technology, 3, 191-195.
3. http://butterflycircle.blogspot.co.uk/2010/09/life-history-of-leopard.html