Hi
Not sure about the hedgehog spines. Are the leaves and debris, often found attached to the spines to camouflage the animal, simply impaled on pointed tips or are they hooked by curved spines? Could be interesting. As to the antlers, you might want to look at D'Arcy Thompson's book, 'On Growth and Form'. It's a classic and analyses biological processes and the resultant forms from their mathematical and physical aspects. There are chapters on the shapes of horns, teeth and tusks and also on spicules and spicular skeletons (re. spines?).
Abby Ingram
Dr A. L. Ingram
Dept of Zoology
University of Oxford
South Parks Road
Oxford OX1 3PS
UK
Tel: 01865 271224
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