We examined 3- to 6-year-old children's attributions of pretence when their own or another's behaviours were characterized as similar (usually unintentionally) to that of a real or nonexistent animal. In some pretence tasks, we asked children if they were trying to look like or looked like the animal they were characterized as looking like; in others, if and how they could (or why they could not) pretend to be a real or nonexistent animal. Children at 4-6 years of age understood their own pretences better than another's pretences, but even by 6 years of age children continued to fail to understand pretence by another. Across ages children tended to be consistent in their claims about whether or not they looked liked (or were trying to look like) the animal, and whether or not they were pretending to be it. Children appear to take someone's merely looking like an animal as evidence that the person (whether self or other) is pretending to be that animal. Their success on self-pretence tasks probably results from their unwillingness to believe that their own actions look like those of the animal because they had not intended to look like it. [For Part B, see EJ941866.]