What are the forms of manifestation of care for offspring in mammals?

Many mammals take care of their offspring even before their birth. The female or both parents build a nest or den in advance, where the cubs are born. In it, they are fed with mother’s milk, warmed up, are clean. Parents protect their offspring from predators, as they grow, pass on their experience in finding enemies, finding food and other vital skills. Taking care of the offspring increases the survival rate of the young.