Ow Siew Ngim's favourite tree is the rain tree. (Photo: Jinee Chen/ CNA)

  • A rover resembling Wall-E has been zipping around the Botanic Gardens and Jurong Lake Gardens recently
  • With a laser scanner and cameras, it is making a digital copy of the gardens
  • These and other tools help the National Parks Board's tree doctors keep two million urban trees in tip-top condition
  • A tree doctor explains how she learnt to 'speak' the language of trees

SINGAPORE: She was once drawn to animals such as monkeys and insects more than trees, which she thought were “quite boring”.