What are mammals? Where do they live? Find out about different mammals on land and in water in this BBC Earth reader. The Ladybird Do You Know? graded readers series comprises a range of non-fiction STEM titles for young learners of English. Covering a variety of topics, Do You Know? adopts an enquiry-based approach, and includes motivating video content, project work and critical thinking activities to develop students' linguistic and twenty-first century skills. Recommended for children aged 7+, there are four levels progressing from CEFR level Pre-A1 to level A2. Each reader is accompanied by online video content, audio, video and comprehension activities, and suggestions for project work. Mammals, a Level 3 Reader, is A1+ in the CEFR framework and supports YLE Movers exams. The longer text is made up of sentences with up to three clauses, some expression of future meaning, comparisons, contractions and relative clauses.