Chiang Mai province, Thailand.
Canon EOS 7D, EF300mm f/2.8L IS USM
1/250 sec at f/2.8, ISO 200
These huge lizards are numerous in the Petchaburi province area, but most easily viewed at the King’s Environmental Research Project. Some fully-grown specimens (over 3 metres) can be observed close at hand, particularly if you are in a vehicle.
Canon EOS 7D, EF300mm f/2.8L IS USM + 1.4x (420mm)
1/500 sec at f/4.5, ISO 125