When a fly lands on a surface it will regurgitate to get rid of the food that it has previously been on which could be anything from faecal matter to rotten flesh.
nasty
If a blow fly lands on food it will most likely deposit an egg. The eggs will hatch maggots which will eat the food and it will go rotten.
When a fly lands on your food it firstly tastes the food with sense organs in its feet. When it realises it is good to eat it then 'vomits' digetive fluid onto the food which turns it into a liquid 'soup' (on a small scale of course - this is only a tiny area but it is enough for the fly). The fly then mops it up using its modified proboscis (elongated mouthparts) which is shaped like a sponge at the end. And they tend to judge us based on our personalities!
No, but they might be carried when the food is transported.
The fly does, so when it lands on food, it can see if it wants to eat what it is on.
Flies do not make nests, they lay their eggs directly on a food source.
It is possible that a fly that lands on your uncovered food in the kitchen, may have just come from walking on dog pooh outside.
A fly does not defecate every time it lands but it is not uncommon for them to do so. They do not specifically defecate at certain times or in one place like many insects.
if your question is why does a dragon fly look like a crayfish? they don't look the same at all. the crayfish looks like a lobster but that is it.
they like to fly
A yellow jacket
No, it doesn't have engines like a plane, therefor, cannot fly like one. However, it does have flight control surfaces which are controlled by the pilot or the commander, so they fly it like a glider on the way back down and when it lands.
A bee fly is a member of the fly family Bombyliidae, with adults which look like bumblebees.