The acid test, however, was to gather data from species where the main burden of parental care falls on the male.
Though the take was small, wildlife officials said their main aim was heightening public awareness of the invasive species.
Overfishing and deforestation have been some of the main causes for the reduction in the number of threatened species.
One of Pombo's main projects in that job has been to rewrite the Endangered Species Act in a way that would aid companies like Pacific Lumber, environmental activists say, at the expense of threatened species.
Although most edible plants grow in the tropics, the main efforts to increase harvests have been based on a small selection of species from industrialised countries.
He said the main cause of decline in wild bees, such as mining and mason species, was loss of habitat due to a variety of reasons including urban development.
Globally, the main threats facing bird populations continued to be agriculture, deforestation and invasive species, Mr Bird explained, adding that there was no sign of the threats disappearing in the near future.
The shark spent six months as the main attraction in California's Monterey Bay Aquarium after becoming the first of her species to survive more than a few weeks in captivity.
The center houses a number of different species including rescued hornbills, honey bears, gibbons and porcupines, but the main attraction is the Orangutans.
Since no plausible evidence has yet emerged of risks to human health from eating GM food, the environmentalists' main remaining objection is that GM plants may cross-pollinate others, spreading their alien genes to other species with unpredictable environmental effects.
Over the centuries, the main culprits in mass food poisoning have often been mycotoxins, such as ergotamine from ergot or fumonisin from Fusarium species, resulting from the fungal contamination of unprocessed crops.
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