Day of the Dead (Spanish: Día de los Muertos), is a holiday celebrated in Mexico and by Mexican Americans living in the United States and Canada. The holiday focuses on gatherings of family and friends to pray for and remember friends and family members who have died. The celebration occurs on November 2 in connection with the Catholic holidays of All Saints' Day (November 1) and All Souls' Day (November 2). Traditions connected with the holiday include building private altars honouring the deceased using sugar skulls, marigolds, and the favourite foods and beverages of the departed, and visiting graves with these as gifts. Due to occurring shortly after Halloween, the Day of the Dead is sometimes thought to be a similar holiday, although the two actually have little in common. The Day of the Dead is a time of celebration, where partying is common. The Day of the Dead celebrations in Mexico can be traced back to the indigenous cultures. Rituals celebrating the deaths of ancestors have been observed by these civilisations perhaps for as long as 2,500–3,000 years. In the pre-Hispanic era, it was common to keep skulls as trophies and display them during the rituals to symbolise death and rebirth. The festival that became the modern Day of the Dead fell in the ninth month of the Aztec calendar, about the beginning of August, and was celebrated for an entire month. The festivities were dedicated to the god known as the "Lady of the Dead," corresponding to the modern Catrina. In most regions of Mexico, November 1 honours children and infants, whereas deceased adults are honoured on November 2. This is indicated by generally referring to November 1 mainly as "Día de los Inocentes" (Day of the Innocents) but also as "Día de los Angelitos" (Day of the Little Angels) and November 2 as "Día de los Muertos" or "Día de los Difuntos" (Day of the Dead).