The researchers did extensive analysis of bats' skeletal and muscular systems before developing a 'robo-bat' skeleton using rapid prototyping technologies, said an NCSU release.

The fully assembled skeleton rests easily in the palm of your hand and, at less than six grams, feels as light as a feather. The researchers are currently completing fabrication and assembly of the joints, muscular system and wing membrane for the robo-bat, which should allow it to fly with the same efficient flapping motion used by real bats.

'The key concept here is the use of smart materials,' Seelecke said. 'We are using a shape-memory metal alloy that is super-elastic for the joints. The material provides a full range of motion, but will always return to its original position - a function performed by many tiny bones, cartilage and tendons in real bats.'

Bunget will present the study at the American Society of Mechanical Engineers Conference in California in September.