The third movie, Ice Age: Dawn of the Dinosaurs was released in 2009 and involves a Lost World filled with DINOSAURS! It turns out there is an entire prehistoric world that somehow survived by being located underneath the surface of the Earth. Manny and Ellie are expecting their first child, and Manny becomes compulsively over-protective of her as he tries to be readily prepared for when the time comes. Sid is jealous and raises three abandoned eggs. They turn out to be baby T-rexes, and when their real mother finds out they were stolen, she takes her three babies and Sid underground, and Sid's friends all go to his rescue. There they meet a seasoned, slightly insane adventurer weasel named Buck, who becomes their guide in surviving this new world, and with an agenda of his own.
Reviews for the film were mostly mixed from critcs, but it was well-received by the general public and was a blockbuster success. The film grossed $196 million domestically and $886 million worldwide against its $90 million budget, making the highest-grossing film in the franchise.
This film is followed by Ice Age 4: Continental Drift.
This film provides examples of:
- Accidental Pervert: Sid tries to milk a muskox to feed his "kids", except...Sid: (running away from the enraged muskox) I THOUGHT YOU WERE A FEMALE!!!!
- Actor Allusion: When the eggs hatch and the hatchlings start playing with Sid, the song "Walk the Dinosaur" comes on. The song appeared in John Leguizamo's first movie, Super Mario Bros. (even if he didn't admit it at first).
- Adult Fear:
- Manny, who witnessed the deaths of his first mate and son, is essentially waiting for the bubble to pop. Then his new mate goes into labor during a dinosaur attack.
- Ellie has a moment of this when her mate and their friend both nearly get Eaten Alive by a carnivorous plant.
- Arson, Murder, and Jaywalking: Buck listing the rules for getting his help.Buck: He who has gas, travels at the back of the pack!Eddie: Aw... [hangs head, walks to the back of the pack]
- Ascended to Carnivorism: The Ankylosaurus that attacks the herd is depicted with sharp teeth like a carnivorous dinosaur, despite being a herbivorous dinosaur
- Attack! Attack... Retreat! Retreat!: Crash and Eddie charge toward a carnivorous plant while carrying sticks like swords and yelling battle cries...then run away screaming from the plant's attacking vines.
- Attack of the 50-Foot Whatever: Manny, if he's the same size as a real mammoth, is about 11 feet tall at the shoulder. Which makes Mama T. rex and Rudy around 40 to 50 feet tall (real life Tyrannosaurus was 13 feet tall at the hips, Baryonyx was 9 feet tall, and for comparison Spinosaurus was 15 feet tall). And that's not getting into the very-oversized Ankylosaurus and Pachycephalosaurus, the Stegosaurus-sized Kentrosaurus, and the Godzilla-proportioned Brachiosaurus. Pretty much the only animals decently sized are Triceratops, Iguanodon, Guanlong, and Troodon.
- Argument of Contradictions: Happens between Sid and a beaver child and its mother when Sid's dinosaur-"kids" harass the other kids on the playground built by Manny.Beaver mother: Aren't you going to do something?!Sid: Why? My kid had it first!Beaver child: Did not!Sid: Did, too!Beaver child: Did not!Sid: Did, too!Beaver child: Did not!Sid: Liar, liar, fur on fire!
- Bread, Eggs, Milk, Squick: As Buck prepares to transfer Ellie to the other side of the Chasm of Death:Buck: Now then, eyes forward. Back straight. Oh, and if you breathe in the toxic fumes, you will probably die.
Ellie: Toxic fumes?!
- Chased Off into the Sunset: Played with, the movie ends with Buck realizing his nemesis Rudy (the great white Baryonyx) is still alive, and goes back to continue fighting him.
- Chest Monster: This movie has a giant carnivorous plant that disguises itself as an innocuous fruit bush.
- Clean, Pretty Childbirth: The baby mammoth Peaches is born, then shown dry and fluffy within seconds after birth. Given that modern day elephants are born in an absolutely torrential downpour of blood and fluids, and it's a movie for kids, this is probably for the best.
- Cliff Stack: At least once.
- Crafted From Animals: Buck's knife, which was created from the tooth of Rudy. Unlike several other instances of this trope, Rudy was no worse for wear for not having the tooth.
- Did You Die?: When Buck is telling the story of his encounter with Rudy, Crash or Eddie asks, "Did you die?" Buck answers, "Sadly yes... but I lived!"
- Die Laughing: The way to the subterranean world goes through a crevasse full of toxic fumes, which is revealed to have very similar properties to Joker's laughing gas.
- Dynamic Entry: "Go Momzilla!"
- Eat My Dust: A gazelle mocks Diego after outrunning him.Gazelle: Eat my dust, Diego!
- Eaten Alive: Little Johnny the aardvark gets eaten by one of the baby T. rex. Thankfully, the baby T. rex spits him out.
- Fluffy the Terrible: Rudy, the fearsome white Baryonyx. Lampshaded by Manny:Manny: Oh, good. Good. I was worried it'd be something intimidating, like... Sheldon, or Tim.
- Foreshadowing: Manny says in the film that one day Sid will "find a girl with low standards, and no real options...". In the fifth movie, Brooke, a female sloth, appears who is attracted to Sid instantly. There also don't seem to be any other sloths in Geotopia, where she lives.
- Good Lips, Evil Jaws: The good Mommy dinosaur vs the Albino dino monster.
- Hartman Hips: Scratte.
- Heart in the Wrong Place: When the acorn is abandoned by Scrat and Scratte, it drifts out to sea and washes up inside an intact ribcage on the beach, right where people who believe this trope expect a heart to be.
- Hungry Jungle: Not only is the Mesozoic Lost World this in general, but it includes the aptly-named "Jungle of Misery" inhabited by flesh-eating plants.
- I Don't Like the Sound of That Place: The path to Sid.
- Inflating Body Gag: As a charging pterosaur prepares to eat the possums, they shoot an explosive berry right in its open mouth, making a hilarious outcome.
- Instant Birth: Just Add Water!: Ellie gives birth in the middle of a Guanlong fight, screaming and wincing, and Peaches comes out already clean, happy and sleepy. One of the most exaggerated Hollywood births ever.
- Jerkass Realization: Both Manny and Diego have this as they spend the first night in the valley. Manny for his insensitive remarks towards Sid which led to this whole mess, and Diego for his selfishness in leaving the herd.
- Kill It Through Its Stomach: Buck successfully frees Manny and Diego from the Man-Eating Plant by entering through its mouth and forcing it to vomit, using Wire Dilemma as a Rule of Funny. Not only does the plant regurgitate the two, but it explodes into a gooey mess.
- Last-Minute Baby Naming: Manny and Ellie have apparently not decided on what to name their child. After the baby mammoth's birth, Manny suggests they name her Ellie, but Ellie decides on the name "Peaches", which had been their code word for Ellie to tell Manny she was going into labor.
- Let's Get Dangerous!:Buck: It's time to get...Buckwild!
- Lighter and Softer: Compared to the somber, dramatic Ice Age and the perilous, apocalyptic Meltdown.
- Living Dinosaurs: Discovered in a Lost World Beneath the Earth.
- Man-Eating Plant: Or mammal-eating plant.
- Meadow Run: Spoofed when Scrat is "reunites" with his acorn after running away from Scratte, and the acorn falls down a hill in slow motion towards Scrat who is also running in slow motion.
- Midair Repair: Buck performs mouth-to-mouth on a pterosaur knocked unconscious by a mid-air collision.
- Mirror-Cracking Ugly: Sid falls through into a cave because of this.
- Mistaken for Pregnant: Sid mistakes a female beaver's fat for a baby bump. Said beaver promptly nails him with a stick.
- Moby Schtick: The film plays this out with Buck and Rudy.
- Monster Delay: Rudy doesn't appear in full for most of the film. Only certain parts of him are seen in a few glimpses (such as his feet or eyes), and he's often obscured by shadows or clouds in wider shots. It's only until the climax that the audience gets a decent look at him when he finally attacks the Herd.
- No Time to Think: Buck ends up facing a Wire Dilemma while inside the carnivorous plant, with only minutes before they're digested. After doing the classic "Eenie-Meenie-Miney-Mo" (in a muffled voice due to being under the digestive juices), he just shrugs and cuts one of the "wires".
- Not Really a Birth Scene: Ellie is giving birth while Diego fights off some Guanlong trying to kill her. At one point Diego is the one appearing to go through labor pains, and then the camera pulls back to show him pushing a pair of Guanlong off a ledge.
- Open Mouth, Insert Foot: During the Not Really a Birth Scene, Ellie's telling Diego to push, and he claims that she has no idea what he's going through. When the camera reveals Diego is pushing back a pair of Guanlong, there's a moment of silence as he processes what he just said before sheepishly apologizing.
- Platonic Declaration of Love: Between Crash and Eddie while they're falling from the sky.Eddie: I love you, dude!
Crash: I know!
- Plot-Mandated Friendship Failure: Diego and Manny have a rift in their friendship when the former decides he's leaving the herd, which greatly offends the latter. The rift starts to close when Diego offers to protect Ellie from the Guanlong, and he and Manny finally reconcile when the saber declares he's staying.
- Ptero Soarer: There are two types of pterosaurs in the film, both of them generic. One of them (labeled as "Pterodactyl") resembles Harpactognathus, while the other (labeled as "Pterosaur") looks like Pterodactylus.
- Rapid-Fire Nail Biting: One of the possum twins bites off his own nails, then his brother offers him one of his hands so he can continue biting
- Raptor Attack: Averted, for Guanlong (a primitive tyrannosaur) is used as a substitute for raptors. Played straight with the Troodon, which look more like Coelophysis and lack feathers, and the Archaeopteryx, which has a lizard-like head and is flightless.
- Rescue Romance: Scrat and Scratte's relationship really kicks off after he rescues her from death by lava when they are hanging by a thin root on a cliff.
- Red Wire Blue Wire: Hilariously spoofed in the carnivorous-plant action-sequence.
- Sand In My Eyes: Invoked and subverted by Diego after Peaches is born, as well as Crash and Eddie.
- Screw This, I'm Outta Here!: When the Herd track down Momma to the hole, Crash and Eddie decide to write off Sid as dead and leave, but Ellie stops them.Crash: Well, he's dead.
Eddie: Real shame.
Crash: He will be missed.
- Seldom-Seen Species: Probably the first theatrical film to feature Baryonyx, Kentrosaurus, and Guanlong.
- Sherlock Scan: Buck tries to make it seem like he has this, but it is really but another product of his madness. At one notable occasion, Buck uses his supposed awesome deduction skills to deduce from a broccoli on the ground that Sid had gone Ax-Crazy and beat down Momma with the broccoli and turned the giant dinosaur into a vegetable. After being told this was implausible because Sid was not violent, he remakes his theory to that Sid was eating the broccoli when he was eaten by Momma, thereby turning the broccoli into a vegetable.
- Stock Dinosaurs: This film has Tyrannosaurus, Brachiosaurus, Triceratops, Ankylosaurus, Iguanodon, Pachycephalosaurus, Archaeopteryx, and Troodon.
- Take That!: Possibly one against Jurassic Park III. In the third JP, a Tyrannosaurus is killed after a brief fight with the Spinosaurus. Well, at the end of the third Ice Age, Mama (a Tyrannosaurus) turns up just at the last moment and attacks Rudy (an overgrown Baryonyx, related to Spinosaurus), effortlessly charging him, slamming him through the jungle and knocking him off a cliff. He doesn't actually die, but it was an incredible asskicking for the supposed Big Bad of all dinosaurs in the series.
- Taking the Kids: The storyline with Sid, Mama Dino and the baby dinos is a parody of this trope, with Sid and Mama Dino playing the divorced parents fighting for custody.
- Tempting Fate: In the Jungle of Misery, Diego warns Manny when the latter is trying to pick some fruit. Manny scoffs that he'll be afraid of a "pretty flower''. Cue carnivorous plant...
- That Came Out Wrong:
- When Manny and Diego are inside the carnivorous plant, they have this awkward exchange as the plant's digestive juices start to rise:Diego: I feel all tingly.
Manny: Don't say that when you're pressed up against me.
Diego: Not that kind of tingly!
- After seeing Peaches for the first time, Buck innocently asks a pterosaur "Have you ever thought about having kids?" The pterosaur gives Buck an awkward glance, then quickly takes off.
- When Manny and Diego are inside the carnivorous plant, they have this awkward exchange as the plant's digestive juices start to rise:
- Third Is 3D
- Transgender: Very briefly implied/alluded to. While on the trip, the group's path is blocked by a butterfly. Buck shoos him off. He says "I knew him as a caterpillar, before he came out."
- Tyrannosaurus rex: Momma and her babies are Tyrannosaurus.
- The Vamp: Scratte, who might also count as a squirrel version of Lady in Red.
- The Voiceless: All of the dinosaurs.
- Verbal Tic: Listening closely to Buck reveals that the weasel is somehow prone to neglecting the usage of the letter H in his speech...which is probably due to Simon Pegg (his voice actor) being English.
- Wham Line: Followed by a Wham Shot. The rest of the herd become affected by the fumes in the Chasm of Death and laugh themselves silly, against Buck's commands. Buck then shows Ellie (and the viewers) why the chasm lives up to its name.Ellie: They're just laughing. What's so bad about that?
Buck: (points to skeletons below) They died laughing!
- Who Is Driving?: Buck captures a pterosaur and commandeers it like an aircraft, along with possums Crash and Eddie, in a tow to rescue Sid. This trope plays with all three of them looking down to check on Sid as they escape; apparently, the pterosaur can't be trusted to fly by itself.