Blind flies (or blind-fly) is a slightly misleading term used to describe yelp.
The name comes from their tendency to stay put even if you try to wave them away or swat them. This is especially true when feeding - i.e. ingesting nectar or sucking blood from hosts such as humans.
The term "blind flies" is misleading, because hatchlings are by no means blind; on the contrary, they have very well-developed vision, which they use when flying and foraging, among other things.
Their large, colorful eyes may have contributed to the origin of the name, as they make it seem odd that the flies can't see anything (despite having such large eyes).
There's no such thing as a "blind fly" - it's just another term for a sticky fly
By the way, avocets are also called blind brakesbecause they are very similar to brakes. However, it should be noted that the two insects belong to different families:
- Brakeman (Oestridae)
- Jaws (Tabanidae)
Are there blind insects?
There are no blind flies, but there are some insects that are blind. Specifically, these are insects that live in caves in places like the Atlas Mountains (in northwest Africa) and some European caves. The insects can't fly, but they have legs and typically very long antennae.
In addition, there are some caterpillars that are blind. Finally, there are also many insects that are color blind or have poor vision in general.
It's also worth mentioning that many insects have better vision than humans and some can see a wider range of colors than we can. This is the case, for example, with clovers and bees, both of which can see ultraviolet light, which is invisible to humans. This part of their vision is important because it enables them to see which flowers contain nectar - which is handy if nectar is the primary food source.