Link to newsround

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

Squirrel monkeys play during the ZSL London Zoo 2020 weigh-in and measurement,Reuters

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.

Zoo keepers Joe Capon (R) and Charli Ellis encourage a Galapagos giant tortoise to stand on weighing scales at ZSL London Zoo 2020 weigh-inReuters

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.

Zoo keeper Laura Garrett encourages meerkats with food to weighing scales at ZSL London Zoo 2020 weigh-in and measurement, in London.Reuters

Meerkats weigh around 730g - roughly the weight of 14 Mars bars.

Otter pup waits to have its weight taken at ZSL London Zoo 2020 weigh-in and measurement.Reuters

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

Zoo keeper Jamie Mitchell places a red-kneed tarantula spider on weighing scales at ZSL London Zoo 2020 weigh-in and measurement,Reuters

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

Keeper Martin Franklin weighs humboldt penguins during the annual weigh-in at ZSL London Zoo, London.Reuters

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

Zoo keeper Meghan Harber uses food to encourage a giraffe to stand beside a height ruler in its enclosure at ZSL London Zoo 2020 weigh-in and measurementReuters

Giraffes can be roughly 800 kg - about half as heavy as a car.

Keepers Jessica Young and Megan Harber weigh Oni the okapi, and measure her pregnant belly, during the annual weigh-in at ZSL London Zoo, London.Reuters

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.

Keeper Mick Tiley weighs Noemie the bactrian camel, during the annual weigh-in at ZSL London Zoo,Reuters

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

More on this story