A Thai veterinarian stands among a group of macaque monkeys in the town of Lopburi, 155 km (96 miles) north of Bangkok, August 19, 2009. Thailand started a birth control programme to sterilise male monkeys with the aim of controlling their population in the famous monkey town of Lopburi. The programme took place after many villagers complained about the increasing numbers of monkeys and their aggressive attacks on people. Picture taken August 19, 2009. REUTERS/Chaiwat Subprasom (THAILAND ANIMALS HEALTH) 

A Thai veterinarian prepares male macaque monkeys before their vasectomy procedures in the town of Lopburi, 155 km (96 miles) north of Bangkok, August 19, 2009. Thailand started a birth control programme to sterilise male monkeys with the aim of controlling their population in the famous monkey town of Lopburi. The programme took place after many villagers complained about the increasing numbers of monkeys and their aggressive attacks on people. Picture taken August 19, 2009. REUTERS/Chaiwat Subprasom (THAILAND SOCIETY ANIMALS HEALTH) 

Macaque monkeys sit in a row in the town of Lopburi, 155 km (96 miles) north of Bangkok, August 19, 2009. Thailand started a birth control programme to sterilise male monkeys with the aim of controlling their population in the famous monkey town of Lopburi. The programme took place after many villagers complained about the increasing numbers of monkeys and their aggressive attacks on people. Picture taken August 19, 2009. REUTERS/Chaiwat Subprasom (THAILAND ANIMALS HEALTH) 

Thai veterinarian Juthamas Sumanam performs a vasectomy on a macaque monkey in the town of Lopburi, 155 km (96 miles) north of Bangkok, August 19, 2009. Thailand started a birth control programme to sterilise male monkeys with the aim of controlling their population in the famous monkey town of Lopburi. The programme took place after many villagers complained about the increasing numbers of monkeys and their aggressive attacks on people. Picture taken August 19, 2009. REUTERS/Chaiwat Subprasom (THAILAND SOCIETY ANIMALS HEALTH) 

A Thai veterinarian reaches to inject a macaque monkey with anaesthesia to prepare it for a vasectomy in the town of Lopburi, 155 km (96 miles) north of Bangkok August 19, 2009. Thailand started a birth control programme to sterilise male monkeys with the aim of controlling their population in the famous monkey town of Lopburi. The programme took place after many villagers complained about the increasing numbers of monkeys and their aggressive attacks on people. Picture taken August 19, 2009. REUTERS/Chaiwat Subprasom (THAILAND ANIMALS HEALTH) 

Thai veterinarian Juthamas Sumanam (L) performs a vasectomy on a macaque monkey in the town of Lopburi, 155 km (96 miles) north of Bangkok, August 19, 2009. Thailand started a birth control programme to sterilise male monkeys with the aim of controlling their population in the famous monkey town of Lopburi. The programme took place after many villagers complained about the increasing numbers of monkeys and their aggressive attacks on people. Picture taken August 19, 2009. REUTERS/Chaiwat Subprasom (THAILAND SOCIETY ANIMALS HEALTH) 

Macaque monkeys sit in a row in the town of Lopburi, 155 km (96 miles) north of Bangkok, August 19, 2009. Thailand started a birth control programme to sterilise male monkeys with the aim of controlling their population in the famous monkey town of Lopburi. The programme took place after many villagers complained about the increasing numbers of monkeys and their aggressive attacks on people. Picture taken August 19, 2009. REUTERS/Chaiwat Subprasom (THAILAND ANIMALS HEALTH) 

A Thai veterinarian prepares an anaesthesia shot to be injected into a macaque monkey for its vasectomy procedure in the town of Lopburi, 155 km (96 miles) north of Bangkok August 19, 2009. Thailand started a birth control programme to sterilise male monkeys with the aim of controlling their population in the famous monkey town of Lopburi. The programme took place after many villagers complained about the increasing numbers of monkeys and their aggressive attacks on people. Picture taken August 19, 2009. REUTERS/Chaiwat Subprasom (THAILAND ANIMALS HEALTH) 

Thai veterinarian Juthamas Sumanam performs a vasectomy on a macaque monkey in the town of Lopburi, 155 km (96 miles) north of Bangkok, August 19, 2009. Thailand started a birth control programme to sterilise male monkeys with the aim of controlling their population in the famous monkey town of Lopburi. The programme took place after many villagers complained about the increasing numbers of monkeys and their aggressive attacks on people. Picture taken August 19, 2009. REUTERS/Chaiwat Subprasom (THAILAND ANIMALS SOCIETY) 

Macaque monkeys sit on the ledge of a building in the town of Lopburi, 155 km (96 miles) north of Bangkok, August 19, 2009. Thailand started a birth control programme to sterilise male monkeys with the aim of controlling their population in the famous monkey town of Lopburi. The programme took place after many villagers complained about the increasing numbers of monkeys and their aggressive attacks on people. Picture taken August 19, 2009. REUTERS/Chaiwat Subprasom (THAILAND ANIMALS HEALTH) 

A Thai veterinarian prepares macaque monkeys before their vasectomy procedures in the town of Lopburi, 155 km (96 miles) north of Bangkok, August 19, 2009. Thailand started a birth control programme to sterilise male monkeys with the aim of controlling their population in the famous monkey town of Lopburi. The programme took place after many villagers complained about the increasing numbers of monkeys and their aggressive attacks on people. Picture taken August 19, 2009. REUTERS/Chaiwat Subprasom (THAILAND SOCIETY ANIMALS HEALTH) 

Macaque monkeys sit in the gap of a fence in the town of Lopburi, 155 km (96 miles) north of Bangkok, August 19, 2009. Thailand started a birth control programme to sterilise male monkeys with the aim of controlling their population in the famous monkey town of Lopburi. The programme took place after many villagers complained about the increasing numbers of monkeys and their aggressive attacks on people. Picture taken August 19, 2009. REUTERS/Chaiwat Subprasom (THAILAND ANIMALS HEALTH) 

A Thai veterinarian prepares male macaque monkeys before their vasectomy procedures in the town of Lopburi, 155 km (96 miles) north of Bangkok, August 19, 2009. Thailand started a birth control programme to sterilise male monkeys with the aim of controlling their population in the famous monkey town of Lopburi. The programme took place after many villagers complained about the increasing numbers of monkeys and their aggressive attacks on people. Picture taken August 19, 2009. REUTERS/Chaiwat Subprasom (THAILAND SOCIETY ANIMALS HEALTH) 

A macaque monkey eats a candy in the town of Lopburi, 155 km (96 miles) north of Bangkok, August 19, 2009. Thailand started a birth control programme to sterilise male monkeys with the aim of controlling their population in the famous monkey town of Lopburi. The programme took place after many villagers complained about the increasing numbers of monkeys and their aggressive attacks on people. Picture taken August 19, 2009. REUTERS/Chaiwat Subprasom (THAILAND ANIMALS HEALTH) 

A Thai veterinarian prepares macaque monkeys before their vasectomy procedures in the town of Lopburi, 155 km (96 miles) north of Bangkok, August 19, 2009. Thailand started a birth control programme to sterilise male monkeys with the aim of controlling their population in the famous monkey town of Lopburi. The programme took place after many villagers complained about the increasing numbers of monkeys and their aggressive attacks on people. Picture taken August 19, 2009. REUTERS/Chaiwat Subprasom (THAILAND SOCIETY ANIMALS HEALTH) 

Thai veterinarian Juthamas Sumanam performs a vasectomy on a macaque monkey in the town of Lopburi, 155 km (96 miles) north of Bangkok, August 19, 2009. Thailand started a birth control programme to sterilise male monkeys with the aim of controlling their population in the famous monkey town of Lopburi. The programme took place after many villagers complained about the increasing numbers of monkeys and their aggressive attacks on people. Picture taken August 19, 2009. REUTERS/Chaiwat Subprasom (THAILAND SOCIETY ANIMALS HEALTH) 

A macaque monkey sits in a building in the town of Lopburi, 155 km (96 miles) north of Bangkok, August 19, 2009. Thailand started a birth control programme to sterilise male monkeys with the aim of controlling their population in the famous monkey town of Lopburi. The programme took place after many villagers complained about the increasing numbers of monkeys and their aggressive attacks on people. Picture taken August 19, 2009. REUTERS/Chaiwat Subprasom (THAILAND SOCIETY)