One problem facing the scientists is that small blue macaws are difficult to sex.

BBC: Brazil hunts for unique lost bird

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

The Blue Throated Macaws are heading to South America, 6, 000 miles away (9, 660 km) from their home at Paradise Park in Hayle.

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

There was plenty else to see, however: jabiru storks, hyacinth macaws and black-collared hawks, as well as howler monkeys, giant otters, caimans and capybaras.

BBC: Spotting jaguars in Brazil

The mood of the notoriously outspoken Venezuelan macaws on being packed off to an island where freedom of speech is a luxury can only be guessed at.

ECONOMIST: Venezuela and Cuba

Just hope not everyone wants to kidnap hyacinth macaws.

FORBES: Fox's Rio Debuts in Rio Tues Night

In what Mr Audrines describes as a barter arrangement (in which the Cubans seem to get the rough end), Caracas will trade them for eight macaws, two tapirs, a puma and four capybaras.

ECONOMIST: Venezuela and Cuba

From there, an easy 10-minute hike to the falls takes you through Kaiteur National Park, where you are unlikely to see other groups of tourists but you can catch a glimpse toucans, macaws and golden tree frogs.

BBC: Guyana��s path to paradise

At Corcovado you can find tapirs, jaguars, pumas, anteaters, two-toed and three-toed sloths, golden orb spiders, moon crabs, a diversification of monkeys (including all four types of Costa Rican monkeys, found only in Corcovado), crocodiles, poison dart frogs, pelicans, 220 species of butterflies, scarlet macaws and even the rare and venomous fer-de-lance snake.

FORBES: Take A Trip To The "Happiest Country On Earth"