Monkeys are seen in a cage at a zoo in Karachi on Friday, after being recovered from illegal traders. AFP

A baby monkey caused chaos in a Pakistan court after escaping from a troop presented as evidence in a case of wildlife smuggling, officials said.

Two men were intercepted outside Karachi on Thursday trying to smuggle 14 baby monkeys in crates usually used to transport mangos. But when they were brought to court on Friday, one of the monkeys escaped — causing chaos as staff tried to tempt it down from a tree.

"The monkeys were kept in the boxes in a bad condition... they could hardly breathe," said Javed Mahar, chief of Sindh Wildlife Department.

The trade or keeping of wild animals is illegal in Pakistan, but laws are routinely ignored and there is a lively market in exotic pets.

Monkeys are frequently kept by street entertainers to attract customers, and in some cases have been trained by criminals to enter houses to steal.

The smugglers were each fined Rs100,000 (around $350) on Friday and the court ordered the monkeys to be handed over to Karachi Zoo — a step immediately criticised by wildlife officials.

"The monkeys should have been returned to their natural habitat from where they were captured," Mahar said.