The zoo staff has trained the gorillas to go through the basic electrocardiogram without being anaesthetised.
Nor are poachers any longer the only people who make money out of the gorillas.
ECONOMIST: The number of mountain gorillas appears to be rising
"There are documented cases of the gorillas getting caught in the crossfire and getting killed, " she said.
She said the gorillas and other wildlife in the park are in danger of getting caught in the crossfire.
CNN: Thousands flee fighting as Congo rebels seize gorilla park
The seizure forced hundreds of rangers who normally monitor the gorillas to flee.
Then the gorillas disappear again into the woods, leading us on a slow-speed chase through the dense foliage for half an hour.
To get to the gorillas, my fellow tourists and I walk through farms to a low stone wall that marks the entrance to the park.
Ekwoge Enang Abwe runs a project to try to safeguard the creatures of the Ebo Forest: the gorillas, chimpanzees and monkeys that are pillaged for bushmeat.
Though the woods are dense and thick, the gorillas leave behind muddy prints the size of baseball mitts, and are easier to spot than you may think.
Smaller operators learn to work alongside, rather than against them, and the gorillas are happy with the chimps and spider monkeys, so long as they keep bringing the bananas.
Rwanda, in particular, has developed a lucrative eco-tourism industry based on rich foreigners who wish to follow in the steps of Dr Schaller and of Dian Fossey, an American researcher who brought the gorillas' plight to the world's attention, and was later murdered, probably by poachers who did not welcome the publicity.
ECONOMIST: The number of mountain gorillas appears to be rising
For example, an organization working on saving mountain gorillas in Rwanda might vividly describe what it would look and feel like to triple the population of gorillas and the employ hundreds of former poachers as tourist guides.
One unlikely success story amid this gloom are the mountain gorillas of Rwanda, Uganda and the Democratic Republic of the Congo.
The answers to the 800 pound gorillas in the budget (social security, medicare, medicaid, military and government pensions) are there.
According to the census, the number of gorillas in the Virunga mountains, which those countries share, has risen by 17% since 1989.
ECONOMIST: The number of mountain gorillas appears to be rising
The BBC spent a day with the "gorillas' cardiologist" while he visited his big patients at the zoo.
But about 1 million years ago the mountain gorillas were cut off from their cousins in West Africa, perhaps by drought, says Olaf Thalmann of the Max Planck Institute for Evolutionary Anthropology in Germany.
As a result, the Virunga gorillas' future looks brighter now than it has for many years.
ECONOMIST: The number of mountain gorillas appears to be rising
"There is no doubt the mountain gorillas would have been wiped out, were it not for ecotourism, " says Allard Blom, a primatologist at the World Wildlife Fund in Washington, D.
Following decades of illegal deforestation and poaching, the number of gorillas at Bwindi has steadied at around 340, and for the first time in years, it is very slowly on the rise.
British-born Apted, 59, has had an uneven career in commercial films over the years, including 1988's Gorillas in the Mistand last year's Bond thriller, The World Is Not Enough.
Gorilla day begins for me with a 4:30 a.m. wake-up call at the Serena Hotel, then a two-hour drive to the Volcanoes National Park, where gorillas live on the Rwanda-Congo-Uganda border.
About 200 of the world's 700 known mountain gorillas lived in the park when rebel leader Laurent Nkunda's men took control of the gorilla section last year, Newport said.
The chat is being held as a belated celebration of Earth Day, which was on April 22, and also to highlight the plight of gorillas.
On average, men have 40% more fat-free mass than women, which is similar to the difference in gorillas, a species in which males unquestionably compete with other males for exclusive sexual access to females.
It's too early in the console war to tell if the Wii's upstart strategy will help Nintendo gain ground against Microsoft and Sony, both 800-pound gorillas of the gaming world.
In West Africa the Ebola virus killed 5, 000 gorillas in just one corner of the Republic of the Congo.
Only a day after their study was published in the journal Nature, the UN's environment and biodiversity agencies warned that some of the great apes - chimps, gorillas, and orangutans - could be extinct in the wild within a human generation.
She fears for the animals' safety, not least because mountain gorillas do not always flee the sound of gunfire and mortars, she said.
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