ABSTRACT
The young of many species stay for a time with their begetters; if they did not, their survival would be imperilled. The close proximity of parents and offspring is brought about in part by parental care and in part by an affiliation tendency in the young. In many species, including man, the neonate is largely helpless, requiring care or nursing. In such altricial species, as they are called, the tie between the parents and their offspring is necessarily due less to the activity of the young than to the activity of the adults. In non-altricial species, sometimes called precocial, infant individuals possess well-developed sense organs, are capable of locomotion, and themselves contribute substantially to the establishment of the bonds between them and their parents.
