The Land Before Time XI: Invasion of the Tinysauruses is a 2005 direct-to-video animated film and the 11th film in The Land Before Time series. It was released on January 11, 2005, by Universal Studios Home Entertainment.
Plot
Every year, as the warm season approaches, a certain tree in the Great Valley blooms with pink flowers. These "treesweets" are viewed as a delicacy by the dinosaurs of the valley and everyone wants their fair share of it. However, because of the tastiness of the tree sweets, and due to the fact that there seems to only be one such tree in the entire valley, there is hardly enough for every dinosaur. Because of this, none of them may eat the treesweets until the day when they reach the "peak of their tastiness". Littlefoot and his friends Ducky, Petrie and Spike wait to eat the first treesweets of the season. Ducky is about to take one, but Littlefoot quickly tells her to stop, reminding them that they may not take any treesweets until "Nibbling Day". This, however, does not stop Petrie from flying to the tree's crown to attempt to take a treesweet, until Cera's father, emerges and states clearly how every dinosaur in the valley has waited all year to taste the treesweets. As Cera appears before them, she boastfully reminds the group that she is the one who is supposed to eat the first treesweet, having been the one who found the treesweet-tree in the first place, although it was Littlefoot who first found it. Cera also teases Littlefoot for being too little to reach the treesweets, offending him.
Meanwhile, Mr. Threehorn is visited by an old friend, a pink female threehorn named Tria. Topps, whom Tria calls Topsy, promises Tria the first treesweet of the season, and Cera becomes jealous. Cera refuses to make friends with Tria and dismisses her. In addition, Cera becomes violent toward her friends when they make any references involving Tria or her father's nickname. Littlefoot wanders off by himself and sulks about how "little" he is. When he returns to the treesweet tree, he climbs the cliff next to it and tries to prove that he can reach the treesweets himself. As he does, he accidentally slips off the cliff, falls right through the tree, and knocks down every single treesweet. Realizing the trouble that he is now in, poor Littlefoot faints in dismay. When he wakes up, he finds himself surrounded by several miniature longnecks (known by their group as tinysauruses). They have eaten all the treesweets and quickly run away once the shocked Littlefoot starts screaming in fear.
Upon noticing that every treesweet is gone, the other dinosaurs suspect that Littlefoot is responsible. Afraid to admit that he made the treesweets fall off the tree under Topps' threat of being banished from the valley, Littlefoot makes a parish truth and blames nearly everything that had happened on the tinysauruses. At first, everyone laughs at him in disbelief, but when they find teeth-marks on an eaten treesweet that are too small for Littlefoot to have made, he is believed and everyone begins to look for the tinysauruses, thinking of them as pests and preparing to drive them out of the valley. As Littlefoot and Cera search the valley, Littlefoot falls down a pothole in the ground where the tinysauruses are hiding. At first, Littlefoot is afraid of them and flees deeper into the cave, but he soon finds them to be nice and befriends them. Upon hearing how difficult it is for the tinysauruses to find food, Littlefoot promises to help bring them as much food as he can every night.
Littlefoot's friends find him while he is bringing food to the tinysauruses. They also fall in the pothole, and upon meeting the tiny dinosaurs agree not to tell the adults. Even Cera, who is still angry with her father, promises to keep it a secret, mainly because she finds out she can relate to them more than they would have imagined. Many of the tinysauruses, including Lizzie, in the colony feel that their leader, Big Daddy, bosses them around too much, though he is only looking out for them. To Big Daddy, the larger dinosaurs of the Great Valley only seem to think that "because they're bigger, it makes them seem more important", and he does not trust the other dinosaurs. By morning, Cera finally decides to be friends with Tria.