Grasshoppers feel pain but not in the same way as humans and other animals do.
It is said that grasshoppers tend to feel more of an irritation than pain as they do not have pain receptors like humans and other animals have.
Grasshoppers can regrow some body parts such as the antenna or leg as a young grasshopper but when they are adult grasshoppers they lose the ability to regrow legs and most other body parts.
If a grasshopper breaks it's leg or loses it's leg they will feel some irritation and the broken leg or lost leg will not grow back or regenerate.
The grasshopper will usually live without the leg but it won't grow back.
It does not really hurt a bug to lose a leg as bugs don't feel pain the same way humans and other animals do.
Bugs don't feel pain when they lose a leg although they do feel some slight irritation and some bugs can live without a leg and even grow back the lost leg.
Bugs do feel and express terror as well as love, jealousy anger and fear.
The longest a bug has lived is 28 and 3/4 years in captivity which was a queen ant Lasius niger Hymenoptera Formicidae.
The insect that dies after 3 days is the Acmopolynema hervali parasitic wasp that lives as an adult for 3 days and sometimes less.
The bug that has a 24 hour lifespan is the Mayfly or Mayflies.
Mayflies only live for 24 hours after they are born and hold the record for having the shortest living life cycle on earth.
Most insects can survive with a missing leg and even some insects can eventually regrow their legs back.
Some types of bugs can live without a leg and some bugs even grow back their legs when they lose them.
For example a stick bug can live without a leg and will grow it back during it's next skin changes.
If a stick insect loses a leg it will still live and eventually the lost leg that the stick insect lost will grow back during it's next skin change.
Insects do know they are alive as insects do have consciousness and awareness.
Insects are also very intelligent and more intelligent than most people think they are.
The rarest bug in the world is the land lobster also known as the lord Howe Island Phasmid or Dryococelus australis.
The land lobster also known as the Lord Howe Island stick insect or tree lobster, is a species of stick insect that lives on the Lord Howe Island Group.
The land lobster is the only member of the monotypic genus Dryococelus.
Land lobsters were thought to be extinct by 1920, however they were rediscovered in 2001.
Insects that are known to mourn their dead are termites, bees and ants and they do so by removing them from the colony and burying them.
The most survivable bug is the diabolical ironclad beetle and Tardigrades also known as extremophiles which can survive in environments.
Tardigrades can actually survive up to 30 years without needing food or water.
The bug that cannot be killed is the diabolical ironclad beetle (Phloeodes diabolicus) which lives under the bark of oak and other trees in the western United States, feasting on fungi growing there.
Just like other beetles do the diabolical ironclad beetle plays dead when in danger.
The animals that cannot feel pain are fish.
Fish cannot feel pain as fish lack the essential characteristics and pain receptors like humans have and hence do not feel pain.
And other animals that cannot feel pain are Sessile animals with no brains such as sponges most certainly cannot feel pain.
Jellyfish, also brainless, also can't feel pain.
While fish cannot feel pain the same way that humans and other animals feel the pain the fish can usually feel some irritation.
So when lacking oxygen from being in the water fish can feel a different kind of pain which is more of irritation when the fish suffocates.
So in a way fish do feel some pain but it's not the same pain that humans and other animals feel.
When a fish is removed from the water and exposed to air, its delicate gill filaments collapse, resulting in a greatly reduced surface area for oxygen exchange.
Or when you go fishing and the fish bites into a fish hook.
The fish biting into the fish hook does not feel the pain the same way as humans or dogs, cats etc would feel the pain.
But it is not completely painless to the fish when they get a hook in their mouth.
The fish does feel some form of irritation but it's not as painful as it would be for a human or other animal.