All 2,500 animals at Whipsnade Zoo in Bedfordshire are being weighed and measured as part of an annual survey.
One of the keepers, Darren Fellows, told ITV News Anglia that they have special scales to weigh the elephants and because the animals response to commands, the task of weighing them is not too difficult.
Click below to watch the interview
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It will brighten up this afternoon with some sunshine in places. However, as temperatures rise, a few sharp showers will break out.
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Rain, followed by heavy showers, will clear east this evening and it will be mainly dry overnight. Minimum temperature: 14ºC.