Victoria was very intrigued. "Yes please!" she answered. "How will we be able to tell them apart?"
Bubbles went rummaging through an untidy pile of books and papers on his desk. He had been putting together some 'Tree Identification' sheets so that he could remember how to identify different trees at different times of the year.
"What do you think of this?" he asked Victoria, triumphantly holding the paper up for her to see.
Victoria peered closely at the paper, then carefully turned it the right way up! "This looks very interesting," she said, smiling. "There are pictures of the outlines of various trees with no leaves on them. Some of them have very unusual branches and curious shapes."