Siege of the NorthÄuring the Siege of the North, Momo did not participate in the battle, instead accompanying Katara and Princess Yue. Momo accompanied the team throughout the rest of their journey. As such, the lemur brought back all sorts of objects, without ever retrieving the desired water. While waiting for Aang to return, Katara requested that Momo fetch water, but he did not understand her words. Sometime later, when Katara and Sokka fell ill, Aang ventured to an herbalist institute, seeking a cure to their illness Momo remained behind, keeping them company. Afterward, the lemur had a brief altercation with the pirate captain's iguana parrot over a waterbending scroll and ultimately defeated it by ensnaring it in a flag. Momo freed Katara from her bonds after the latter was tied to a tree. He wore the headdress of the Great Sage while accompanying Appa as the bison rescued the group from the collapsing temple. He later helped to subdue the sages by attacking the Great Sage, thereby creating a distraction for Aang to enter the sanctuary. During the events on the winter solstice, Team Avatar created a successful ploy to trick the Fire Sages into opening the Crescent Island Fire Temple sanctuary by having Momo crawl through the pipes into the chamber and move about, casting a shadow. The guards initially thought Momo was the earthbender, observing that he had raised arms to lick them clean, but Sokka corrected them, stating that the bender was Katara. Through an elaborate scheme involving air vents, a large boulder, and Aang's airbending, Katara feigned earthbending. Later, Team Avatar developed a plan with the objective of Fire Nation guards arresting Katara so she could rescue Haru from his imprisonment. Momo, however, had eaten a large amount of fruit and was unable to fit through the vent. Aang planned to have Momo slip through an air vent to reach Appa for help. Momo and Team Avatar traveled to Omashu where they were detained in a prison chamber by King Bumi. From this moment on, Momo remained a constant addition to their family, accompanying the team on their journeys throughout the world. Aang decided to keep the lemur as a pet and named him "Momo" after he stole a moon peach from Sokka. Afterward, the lemur provided Sokka with a quantity of food.
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A chase ensued between Sokka and Aang, which ultimately led Aang to discover Monk Gyatso's corpse. Aang took interest in him and longed to adopt him as his new pet in contrast, a desperately hungry Sokka wished to eat their newly discovered companion for dinner. Afraid that it was a firebender, they hid behind two Avatar statues, only to discover that the intruder was just a lemur. While visiting the Southern Air Temple in late 99 AG, Avatar Aang, Katara, and Sokka heard a strange noise from the doorway of the sanctuary of the temple, indicating that someone had entered the room. Momo had been living in the Southern Air Temple. 1.4 Traveling through the Earth Kingdom.