its size.
The Prepona Butterfly is the fastest of all butterfly species, with the capability of flying at a top speed between 40 and 50 miles per hour!
Butterflies can attract other butterflies quickly through visual cues such as their bright colors and patterns, as well as by releasing pheromones. These signals can help butterflies locate and communicate with potential mates in a short amount of time.
Yes, they move them constantly up and down at a supremely fast rate to stay in flight.
Small, delicate, fragile, colorful, flying, antennae, wings, legs, proboscis, body, slowly, fast, delicately, gliding sailing, souring, swifting, still, bright, light, large, moving, shiny, dull, dark
Fast-moving streams do not provide a stable environment for fish eggs or young fish to develop. The turbulent water can wash away eggs and disturb the development of the fry. Additionally, fast currents in streams make it challenging for adult fish to find suitable spawning areas.
its frame of reference
I have no idea
One factor of course would be how fast the wave is moving.
fast moving
fast
moving fast in Japanese is "subayai"
The density of the medium through which it is travelling: for example, about 343m/s in air; almost 1500m/s in sea-water.
Fast moving stream
How fast molecules are moving. If they are moving fast its hot, but if they are moving slow it is cold
Gas has fast moving particles.
Fast moving electrons are equivalent to beta radiation.
Either how much light there is OR whether the subject will be moving relatively fast.