Tear Jerker / Dinosaur Revolution

• The first episode's depiction of the Permian extinction. Specifically how the Inostrancevia, after barely escaping falling into a river of lava, climbs to safety... only to see the entire landscape covered in lava, looking very much like a vision of Hell itself. He doesn't even try to run, only sits down and watches as his entire world is destroyed before his eyes, letting out one last Skyward Scream before a wave of lava overtakes him and pretty much disintegrates him...
• The second half of the last episode. We see almost all of the main dinosaurian cast die off one by one. In particular, the part where the female Troodon returns to her mate and finds that he and most of their eggs have died from the cold, and the bit afterwards where she picks up the sole surviving egg and brings it with her into the mouth of a recently dead Tyrannosaurus where she attempts to brood it, completely alone and forlorn. The fact that we don't see her death and that there's something of a Hope Spot in the egg but at the same time know the inevitable outcome of the extinction only makes it worse.
  • Listen closely to the mother Troodon after she realizes that her mate has died. Not only does she sound absolutely distraught, she almost sounds like she's crying.
• The "farewell" scene in the second episode where all the animals leave the watering hole, leaving Broken Jaw all alone. Some of them even appear to "say goodbye" to him.
• Broken Jaw being crippled and abandoned as a hatchling.
• The weaker male Cryolophosaurus getting beaten up by a rival, and eventually getting his crest bitten off. He doesn't even bother to try standing up afterward.
• Tinkerbelle weeping for her murdered infants.
• The old male Protoceratops, upon escorting the orphaned juvenile to a herd, goes off to die on his own.
• The young Protoceratops seeing its dead parents being eaten in front of its eyes.
• In the mosasaur segment, one of the baby mosasaurs can be heard crying for its mother as a pair of sharks come dangerously close to eating it. Fortunately, mommy comes just in time.
• At the end of the Rahonavis segment, as the Sauropod-herd passes the Majungasaurus-mother looks up and starts calling for her children... As it cuts away, you can tell she is looking around more panicked.