The 43-year-old fund manager is a rare species in Hong Kong's often-turbulent financial world.
One of them, a retired union coal miner, was identified to me as if he were a rare species of bird.
An avid horticulturalist, he charmed Catherine Deneuve at a dinner party by talking with her for hours about a rare species of peony.
For years, teams customarily used two wingers, but they've become a rare species as clubs have focused on attacking down the middle of the field.
In addition, the government banned helicopter tours after Peru's Institute of Natural Resources found low-flying aircrafts to be contributing to the disappearance of a rare species of orchid and the Andean Condor.
Others remember an efficient administrator (admittedly, a rare and valuable species in Russia), always polite, but with no feel for bigger questions.
The decline has been measured only for a few very rare species but it is clear from surveys that numbers of even the currently most abundant species have gone down.
The first large-scale survey revealed a treasure trove of rare species, including Siamese crocodiles, previously thought extinct in the wild.
Home to orangutans, pygmy elephants and clouded leopards, this northeast region in the state of Sabah is a hotspot for rare and endangered species.
The region contains a number of lakes, mires, meadows, swamp and lake complexes with peculiar flora and fauna, including a number of rare and endangered species.
It's even home to some bizarre-looking Xoloitzcuintle dogs, a rare pre-Hispanic, hairless species.
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Meanwhile Arctophila superbiens and Arctophila bombiformis, two other hoverfly species, each of which accurately resembles a particular bumblebee species, are restricted in distribution and rare.
Environmentalists said the area is a breeding ground for bird species including rare skylarks and lapwings.
The first was a very rare 12ft (3.6m) Sowerby's beaked whale - normally a deep water species which feeds off squid and cuttlefish.
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North Highland Forest Trust (NHFT) said the species was important to rare insects and a key component in healthy wild habitats.
The BBC's Duncan Kennedy in Sydney says it is extremely rare for people to be attacked by saltwater crocodiles - a protected species in Australia.
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"Aggressive" invertebrates and rare jellyfish were among species identified by volunteers taking part in a research project along the North East coast.
The other is that upgrading subspecies into species simultaneously increases the number of rare species (by fragmenting populations) and augments the biodiversity of a piece of habitat and thus its claim for protection.
This is because an area may have many rare species, but not enough living matter to, say, prevent a coastline from being eroded.
To Roberts, Lake Zakher has reliably proved something of a birdwatcher's paradise, with herons, flamingos and stilts among the rich diversity of species drawn to this rare water source.
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