Pictures: All the animals at London Zoo get a health checkPublished26 August 2011Image caption, Every year London Zoo measures its animals to check their health. We wouldn't want to hold this red-kneed tarantula long enough to measure it with a ruler. That's a lot of legs!Image caption, It's no easy job weighing all the animals. As you can see this Galapagos turtle was no lightweight. Those are some pretty big scales!Image caption, This emperor tamirin jut wants to monkey around - sticking out it's tongue out on the measuring scales.Image caption, Sometimes they need some pretty long measuring tapes to size up animals like this milk snake.Image caption, This tamandua finds a branch to lick whilst the zoo keepers check how much it weighs. Tasty?