Cultural variations
Attitudes and laws regarding adoption vary greatly. Whereas all cultures make arrangements whereby children whose birth parents are unavailable to rear them can be brought up by others, not all cultures have the concept of adoption, that is treating unrelated children as equivalent to biological children of the adoptive parents. Under Islamic Law, for example, adopted children must keep their original surname to be identified with blood relations, and, traditionally, women wear a hijab in the presence of males in their adoptive households. In Egypt, these cultural distinctions have led to making adoption illegal opting instead for a system of foster care. Homecoming Day
In some countries, such as the United States, "Homecoming Day" is the day when an adoptee is officially united with their new adoptive family. See also
References
Barbara Melosh, the American Way of Adoption page 10

Further reading
Argent, Hedi. Related by Adoption: a handbook for grandparents and other relatives (2014)
Askeland, Lori. Children and Youth in Adoption, Orphanages, and Foster Care: A Historical Handbook and Guide (2005) excerpt and text search
Carp, E. Wayne, ed. Adoption in America: Historical Perspectives (2002)
Carp, E. Wayne. Family Matters: Secrecy and Disclosure in the History of Adoption (2000)
Carp, E. Wayne. Jean Paton and the Struggle to Reform American Adoption (University of Michigan Press; 2014) 422 pages; Scholarly biography of an activist (1908–2002) who led the struggle for open adoption records
Conn, Peter. Adoption: A Brief Social and Cultural History (2013) excerpt and text search
Eskin, Michael. The Wisdom of Parenthood: An Essay (New York: Upper West Side Philosophers, Inc. 2013)
Fessler, Ann.
A mammary tumor is a neoplasm originating in the mammary gland. It is a common finding in older female dogs and cats that are not spayed, but they are found in other animals as well. The mammary glands in dogs and cats are associated with their nipples and extend from the underside of the chest to the groin on both sides of the midline. There are many differences between mammary tumors in animals and breast cancer in humans, including tumor type, malignancy, and treatment options. The prevalence in dogs is about three times that of women. In dogs, mammary tumors are the second most common tumor (after skin tumors) over all and the most common tumor in female dogs with a reported incidence of 3.4%. Multiple studies have documented that spaying female dogs when young greatly decreases their risk of developing mammary neoplasia when aged. Compared with female dogs left intact, those spayed before puberty have 0.5% of the risk, those spayed after one estrous cycle have 8.0% of the risk, and dogs spayed after two estrous cycles have 26.0% of the risk of developing mammary neoplasia later in life. Overall, unspayed female dogs have a seven times greater risk of developing mammary neoplasia than do those that are spayed. While the benefit of spaying decreases with each estrous cycle, some benefit has been demonstrated in female dogs even up to 9 years of age.