What is the fine-grained topic of the following text: Instead, 21st century taxidermy employs state-of-the-art materials and techniques such as polyurethane foam and epoxy resins, cryogenic freezing and vacuum treatment, air brushing and precision instruments in order to achieve the same aim: to preserve as much as possible of the original, or to create replicas as lifelike as possible using modelling techniques. Only return the topic.
Modern Techniques in 21st Century Taxidermy