wanted gears for ornithopter   .......can any one help  

hard to say,you can find it yourself,try visiting shops.chose gears and match them as per your requirment

give the following details
material -
dia -
no. of teeth , straight or slant
pitch modulus


then we can help you out .. otherwise your question is too general

Motor pinion gear: 64P20Tpinion gear　
First gear GWS64P58T spur gear +48T6T pinion wire
Main gear:0.5M 72T