The emergence of bird flu has posed a major challenge to scientists designing vaccines as it can infect a number of different animals, including birds, pets and people.

禽流感的出现给科学家设计疫苗带来极大的挑战，因为禽流感可感染许多不同的动物，包括鸟禽、宠物和人类。

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A nature reserve is an ideal home for many plants and animals, including different kinds of birds.

自然保护区是许多动植物地理想家园，包括不同种类地鸟。

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There are many different types of animals living in or near the waters of the Nile, including crocodiles, birds, fish and many others.

在尼罗河水域或附近地区有很多种类各异的动物，包括鳄鱼、鸟、鱼和很多其他动物。

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Flu virus is found throughout nature and different strains can infect a variety of hosts including humans, dogs, horses, swine, bats and birds.

BBC: Winter bugs: A yearly battle for dominance