Making a Difference in the Amazon; GO Voluntourism Is a Growing Trend for Travellers Looking for a Unique Experience. Victoria Mitchell Finds out More by Joining an Earthwatch Expedition in the Northern Peruvian Jungle
It's pitch black as we set off in a small wooden boat along a tributary of the Samiria River, deep in the Amazon basin.
The low hum of the outboard motor is drowned out by a cacophony of strange sounds made by the many nocturnal species living in Peru's northern jungle region.
Our guide, a local from one of the nearby villages, skims the surface of the water with a search light.
Suddenly the boat stops. I can see two shiny spheres, like giant marbles, floating on the calm water.
In one fell swoop our guide - skilfully balanced on the bow of the boat - lunges forward and throws out a noose.
A caiman, a reptile from the alligator family, is thrashing about in a desperate bid to break free.
The guide tapes its mouth and gently binds its feet. Calm is restored and the caiman can only lie subdued on the bow while we gather round.
First, we weigh the caiman with a portable scale. Then we measure its length, breadth, the size of its head and check its sex. It's a female, about two years old and, in my mind, it looks big!
Hands still shaking - I was the one who had to measure its head - I write down the data, while the guide releases the unharmed caiman back into the river.
Catching wild animals might sound like madness, but there is good reason for our actions.
I've travelled to the Pacaya-Samiria National Reserve in northern Peru as part of an Earthwatch Institute expedition.
Along with 11 other volunteers, I'm here to help researchers survey the wildlife so they can monitor the health of the aquatic and terrestrial habitats.
Prior to this trip, I'd never been on a volunteering holiday. But I was keen to get involved in something that would make a difference, however small.
Tour operator Kuoni offer a variety of responsible holiday programmes all over the world as part of their Ananea programme, which has grown in response to customers' demands for more experiential holidays.
I opted for Earthwatch, an international environmental charity conducting biodiversity surveys in Peru's Samiria river basin.
Data about the population and health of animals in this flooded forest ecosystem is an important indicator of the impact of global climate change and can also be used to help establish new protected areas in the rainforest.
During my week in the jungle, I will help to count grey and pink river dolphins, capuchin monkeys, bats and brightly-coloured macaws. We will even catch and weigh piranha, which requires a deft touch and thick gloves due to their sharp teeth.
Earthwatch will use the data we collect to help develop sustainable conservation strategies for the reserve while also considering the needs of the indigenous people.
The Samiria reserve covers more than 8,000 square miles and is rich in biodiversity but is also home to more than 42,000 people and 94 communities.
The local communities are self-sufficient and use the forest's resources for food, medicine, building homes and canoes. …