Darwin said that animals, like humans, have many feelings, such as joy and sorrow. Plinius Major, the naturalist and Roman philosopher, recorded stories of elephants grieving for her death. But scientists and philosophers have been hesitant over the last two centuries to describe the behavior of animals when their peers die as an expression of "sadness" for fear of resembling humans.". If the newly lost animal is seen as being homely, starving, sleep deprived, or not walking in the usual way or exhibiting sorrowful behavior," she says, , We can assert that the loss of close associates provokes a response to the sentimental of all animals.. Scientific evidence confirming the prevalence of grief among animals has increased the loss of peers over the past decade.. Some scientists have proposed a new study to study the evolution of death-related behaviors, with the aim of studying death and annihilation from an evolutionary perspective.. Perhaps this leads us to wonder: Why do we feel the pain of separation? Humans and animals behave when they are saddened to lose close friends in different ways that may simply put them to death.Some animals are tempted to stay out of contact, sleep, eat, even hunt and mate. If she spends too much time beside the carcass, she may expose herself to disease and become an easy prey for predators. While the sadness of the death of a close friend may be more depleted of energy, time and money, given the land we devote to the burial of the dead, the cost of funerals, and the pain of separation. . We may experience many painful experiences throughout our lives, but physical pain, from burning or superficial injury, has evolved in humans to help us move away from the source of pain. In this case the pain is useful.