Those areas seem to have a combination of factors that include the right kinds of virus-carrying mosquitoes and birds, along with large numbers of people who can be infected, Nasci said.

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The first of the three parks we visited was Lake Manyara National Park, a lush nature reserve teeming with all kinds of animals, including giraffes, elephants, exotic birds and baboons.

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The white birds, which are a hybrid of four kinds of ducks, including mallards, swim between the rice stalks.

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Pay attention to the trees and water stations throughout the sanctuary for the chance to spot six different kinds of playful hummingbird, plus red-and-blue masked trogons and a host of other tropical birds.

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Smartphones of various kinds are the universal global computer, essentially, and the huge audience means companies such as Angry Birds creator Rovio can become huge very fast.

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