Breeding a Rare Mammott in My Singing Monsters involves combining a Mammott with a monster that has the Earth and Cold elements. The most common combination is Mammott and Entbrat, which has a 12.5% chance of breeding a Rare Mammott. Other possible combinations include Mammott and Thumpies, Mammott and Pango, and Mammott and Shrubb, all with a 6.25% chance of breeding a Rare Mammott.
Rare Mammotts have a unique appearance, with a blue body and yellow horns. They also have a different song than regular Mammotts. Rare Mammotts can be used to decorate your island or to breed new monsters.