Roses have thorns as a physical defense mechanism to deter herbivores and prevent them from being eaten. They also produce chemical compounds, such as tannins and phenolic compounds, that can make them unpalatable to animals that may try to consume them. Additionally, roses can release volatile compounds as a form of chemical defense to deter pests or attract beneficial insects.
Orchids do not have any known defenses against being eaten. Aphids, scales, mealybugs, spider mites and some other insects and arachnids may eat orchids.
I don't know if this a defense or merely a way to escape being eaten, but most species of geckos can detach their tail when they get scared or when it is grabbed. It will grow back later.
Their first line of defense is to escape, usually by climbing a tree. Failing that, they do have sharp teeth and claws and will use them for defense.
It's similar to how some plants are safe to eat (like spinach) and some are not (like foxgloves). Some plants/fungi have developed 'being poisonous' as a defense mechanism against predator's. Being poisonous or toxic prevents them from being eaten by curious animals.
Small animals like turtles know they have no defense against larger animals, so they run so they can hide and get eaten.
Thorns are a defensive adaptation of plants against being eaten by grazing animals.
Raccoons will try to escape a predator, usually by climbing a tree. If that is not possible, they have sharp claws and teeth that they will use for defense.
Cockles have a thick, hard shell that provides physical protection from predators. When threatened, cockles can quickly close their shell, reducing the likelihood of being eaten. Additionally, some species of cockles can burrow into the sand to hide from predators.
There mothers protect them with their powerful bite against enimy
Plants with physical defense mechanisms include those with thorns or spines (such as roses or cacti), hairs or trichomes (like stinging nettle or poison ivy), and tough outer shells or rinds (like coconuts or chestnuts). These defenses help protect the plants from herbivores and reduce the likelihood of being eaten.
In defense, if a poison dart frog is eaten, it will harm whatever ate it.