Animal life is remarkable in its diversity, particularly in the variety of shapes and sizes we see around us today, and in some ways even more remarkably in those life forms that have long gone extinct. How does this variation come about? And is it limited in its possibilities, or infinite?

Dr Emma Sherratt is an Australian Research Council Future Fellow. She is a world expert in the analysis of animal form and evolution. Her research spans animals big and small, from sea snakes to scallops, frogs to fossil lizards, and mammals to cuckoo eggs. Her website is www.emmasherratt.com.

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