The trust said current figures show up to 120 Blue Throated Macaws live in the wild in Bolivia.

BBC: Rare macaws bred in Cornwall to be flown to Bolivia

Having spent most of their lives in captivity, the chimps are not suitable to live in the wild and will need care and feeding for years to come.

CNN: Chimps in need after U.S. organization withdraws care

The Whitley Wildlife Conservation Trust has recently been awarded a number of key grants and donations, including one from Chester Zoo to cover the cost of the expedition to discover how many of the Sulawesi crested black macaque currently live in the wild.

BBC: Devon charity to track endangered macaque

In the wild they live to about age 40.

FORBES: Meet the Relatives

On average, ospreys live for between 10 and 15 years in the wild.

BBC: 'Oldest' breeding osprey lays 62nd egg at Loch of the Lowes

There are about 600 pandas left in the wild: more than half the bamboo forests where they live have disappeared in the last 30 years.

BBC: NEWS | Science/Nature | UN alert on threat to wild bamboo

Another case relates to a live puma that was captured in Inverness-shire in 1980 and had been living in the wild for a long period of time.

BBC: 'Big cat' Canadian lynx was on the loose in UK in 1903

Freshwater pearl mussels can live for up to 100 years and only thrive in clean water as well as requiring the presence of wild salmon to reproduce.

BBC: NEWS | UK | Scotland | Rare mussels are moved for safety