Some animals grow thicker fur, or live in tree holes or underground to stay warm.

有些动物会长出浓密的毛发，或者居住在树洞或地下来保暖。

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The animals, created using the tube lines, stations and junctions of the London Underground map were first spotted by Paul Middlewick in 1988.

1988年，英国艺术家Paul Middlewick首次把伦敦地铁轨道线、站点和换乘点相链接，创造了这些动物图案。

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These are the Animals on the Underground, over 30 have been "found", someone has even turned these into a book.

这些就是地铁里的动物们，现在已经发现的种类超过了30种，有些好事者甚至已将他们编册成书了。

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"It's an explosion, they are behaving like hunting animals, " said Patrick Moenaert, mayor of the towns of Brugge and Zeebrugge, which recently built two underground dumps to keep gulls from the garbage.

WSJ: Real-Life 'Birds' Remake in Belgium