1 single drone – 4 sizes

1 single drone, one viewing angle, 4 sizes, animated apngs – endless loop.
 
Check it out: https://singledrone.s3.eu-central-1.amazonaws.com/index.htm
All files are animated and alpha channel (transparent BG)
File sizes:
drone 1: 685kb 121×57
drone 2: 1197kb 174×82
drone 3: 3513kb 349×164
drone 4: 10054kb 698x 329