Jenny Cheng Cheuk-man has the face of a seafarer - weathered by the wind, sun and rain she endures while taking people to see Chinese white dolphins off Lantau. She is also someone who obviously believes in the value of her job and tries to help people understand the importance of protecting the environment and endangered dolphins. 'I love the job because it is meaningful,' said Ms Cheng, who is chief executive of environmental protection firm Eco Action. Ms Cheng, who graduated from Hong Kong Polytechnic University with a degree in tourism management, said children could gain more from seeing dolphins in the wild than in the classroom. During her four years with Eco Action, she has guided nearly 300 dolphin-watching tours, mostly involving primary and secondary school students. Ms Cheng became interested in wildlife as a schoolgirl. 'My father was really fond of watching wildlife programmes on TV when I was a child. I usually sat beside him and was attracted by the various animals, especially the cute dolphins.' But she said her family did not fully support her choice of job. 'They might think this work is too boyish,' she said, shrugging her shoulders. Ms Cheng is quick to point out Eco Action is not profit-run. 'We only charge $50 to $70 per person, enough to keep our organisation alive, while travel agencies charge about $100 to $200.' Ms Cheng said the greatest reward in her job was the feedback from children after the trips. She said one young girl called her office hotline during the Sars outbreak, anxiously asking whether the white dolphins could be infected by the virus. 'I was moved by this naive concern because it showed they cared about the dolphins in their hearts. That was exactly what I expected.' As well as the feedback, Ms Cheng finds the trips rewarding. 'Even though the routes are almost the same every time, I never get bored because there is always something fresh - and even mysterious - during each trip.' She remembers once seeing about 10 dolphins swimming in a circle near Lung Kwu Chau island before suddenly rushing away in a straight line. 'I think they were trying to convey something to us through that demonstration.' As interesting as the job is, it is not easy to become a qualified dolphin-watching conductor. 'We have to know the habits of the dolphins in detail, and have the skill to tell what they are doing by their gestures - finding food, making friends or playing games. 'Once we determine what they are doing, we can make the correct decision about approaching them without disturbing them.' These days, Ms Cheng spends much of her time training new guides in a 10-session course. 'The basic qualification for a guide is they must love the dolphins and nature,' said Ms Cheng, who is critical of some dolphin-watching agencies. She believes their behaviour has led to a decrease in the number of white dolphins in Hong Kong waters. 'They know nothing about the dolphins, let alone do anything to protect them,' said Ms Cheng, adding that some staff were not properly trained. But she acknowledged that over-fishing and water pollution were the main dangers faced by white dolphins.