Interesting but perhaps these have better performance..
Lazy Hawk RC ornithopter soars with live Turkey Vultures
https://www.youtube.com/watch?v=tYppW3XwoXI
This one needs oiling...
https://www.youtube.com/watch?v=dbFNARL565g
Kestrel
https://www.youtube.com/watch?v=A0e5TCVsyAA
3 grams with onboard video (needs some work)
https://www.youtube.com/watch?v=pMvcnVGzCyY