Naturalist and wildlife cameraman Hamza Yassin joined Stratford schoolchildren for a special event.
The Canal & River Trust Explorers event last week celebrated the upcoming publication of his book Hamza’s Wild World.
Children from Bobby Moore Primary School in Queen Elizabeth Olympic Park, heard Hamza's nature-watching tips and stories from his adventures as a conservationist.
The event, led by Canal & River Trust's Mike Wakeford, aimed to teach children about water birds and wildlife, and how to stay safe by water.
Each child received a copy of the book, which will be released on July 3.
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Hamza said: "It was so brilliant to spend the morning with a super enthusiastic group of children and share stories from my book.
"We spotted a mute swan chasing a Canadian goose down the River Lea, an inquisitive fox cub lured out by the sound of some coot chicks, and heard a reed warbler - all in broad daylight on the edge of the park."
Annette Simpson, learning and skills manager at the Canal & River Trust, said it was fantastic "for someone as knowledgeable and respected" as Hamza to support its work.
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