Yes, there are many reptile (which is a group of animals) whose tail comes of when a predetor tries to grab it. For example the Leopard Gecko
Antlion gecko crab spider
They ring for it?
Fishermen says that the thunder crab let's go it's prey when thunder strikes.
it depends on the animal
both, they eat creatures smaller than themself, and larger animals prey on them.
Crab Spiders camouflage in flowers and eat bees and butterflies that come in search of nectar. Crab spiders can kill insects much larger than them. Mother Crab spiders do not eat. Giant Crab spiders eat cockroaches and pests that crawl in roses. They eat insects that come close. They eat bees. Crab spiders use a rapid position to kill their food. They eat pests that are near. Crab spiders catch their prey with their front legs
pinchers
The King Crab is carnivore. It eats for example some fish parts.
shark and tuna can be considered as predator and prey that shark feeds on other organism and tuna becomes a prey to the sharkoctopus and a crab. the octopus is the predator who eats the prey, the crab
smaller animals or dead animals
Wall crab spiders primarily feed on small insects, such as flies, moths, and other arthropods that come into contact with their webs or are found in their vicinity. They are ambush predators, using their excellent camouflage to blend in with their surroundings and pounce on unsuspecting prey. Their diet can vary based on the availability of prey in their environment.
Crab spiders eat insects, they inject venom into their prey, then they will take it back to there home and eat it!