But Klenzendorf argues that focusing conservation efforts on these vulnerable species can lead to the best conservation programs.
But Dr Avery added that the BAP had focused efforts on stemming the decline in a number of vulnerable species.
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Polar bears live along the Arctic Circle and are considered a vulnerable species by the International Union for Conservation of Nature in Switzerland.
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The Zambian barbet (aka Caplin's barbet) is the country's only endemic bird and, due to its small population and disappearing habitat, has been listed as a vulnerable species (likely to become endangered).
Experts identified the area as an environmentally fragile cheetah breeding ground, and a 1996 management plan aimed to protect the vulnerable species by banning jeep-led safaris, which could interrupt hunts or scare and separate families.
It describes how vulnerable species that overtly display characteristics human beings respect or find desirable -- such as beauty, strength, power or cuddliness -- are more likely to be the focus of concerted conservation programs than animals or plants that are less appealing to the eye.
One major reason the Caribbean is so vulnerable is that many species are found only within a small habitat on just one island.
One penultimate index of health, or lack thereof, is the IUCN Red List, which elucidates those many species that are vulnerable, rare and endangered throughout the world.
Several reassessments of the status of this species have taken place since the start of the reintroductions, and in 2011 the species qualified for listing as Vulnerable.
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Asian short-clawed otters - the world's smallest otter species - are classed by conservation organisations as vulnerable to extinction.
The focus upon human mortality rates associated with climate change serves to remind us that the far vaster constellation of life species upon which we depend is far more vulnerable than we are.
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Some birds -- including migrant species and long distance dispersers -- are more vulnerable to radiation than others, he said.
Many of these species are classified as globally endangered, threatened or vulnerable by the International Union for Conservation of Nature (IUCN).
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Moreover, our reliance on so few plants and animal breeds makes human populations that much more vulnerable to climate change: as growing conditions change, the most suitable species, breeds or strains in a given region may likewise change.
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Two years ago, scientists compiling the internationally recognised Red List of Threatened Species decided to include polar bears, giving them a listing of Vulnerable to Extinction.
The species are listed on the International Union for Conservation of Nature (IUCN) Red List - a comprehensive source of information on the status of wild species facing a high risk of global extinction - as being 'vulnerable'.
At Kaziranga, home to many endangered species, the focus is on the park's 80 tigers because they are especially vulnerable in the crisis.
According to Dr Sybille Klenzendorf, director of World Wildlife Fund's species program, there is already a wide body of evidence that suggests people are most interested in vulnerable animals that most closely resemble human beings -- usually large mammals with forward-facing eyes.
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