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London Zoo: How much do you think these animals weigh?

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Squirrel monkeys play during the ZSL London Zoo 2020 weigh-in and measurement,Image source, Reuters
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Common squirrel monkeys are very light, weighing an average of 270 grams - less than a tin of soup. But black capped squirrel monkeys (pictured) are much heavier at 620g - roughly the same as a basketball.

Image source, Reuters
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A male Galapagos giant tortoise can weigh around 227 kilograms - that's almost three times the average weight of a man in the UK. Female Galapagos tortoise average about 113 kilograms - around twice the weight of an average woman in the UK.

Image source, Reuters
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Meerkats weigh around 730g - roughly the weight of 14 Mars bars.

Image source, Reuters
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Sea otters can range in size from 22kg - three times as heavy as a bowling ball - to 45 kg, more than double that!

Image source, Reuters
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A red-kneed tarantula spider can be very light. They often weigh around 15-16g - just a little bit more than a AAA battery.

Image source, Reuters
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Humboldt penguins on average weigh around 4.5 kg - the weight of more than 70 tennis balls.

Image source, Reuters
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Giraffes can be roughly 800 kg - about half as heavy as a car.

Image source, Reuters
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An okapi can weigh between 200 – 350 kg - which is about as heavy as a tiger. Although, this one is pregnant so is carrying a bit more weight than normal.

Image source, Reuters
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The average weight of a Bactrian camel is 480 kg - almost as much as a full-size concert grand piano.