* Nigel and the popular big cat expert Sabah Huntingdon mourning for sabretooth cats which suffer hunger and finally die because of starvation. And also the sad story of Martha the mammoth and her sister, even though it ends happily this time.
** [[FridgeLogic They could travel through time, yet they couldn't arrive in time to save these animals?]]
*** It looked like they were taking the animals from the times they were becoming extinct to not have as big an effect on the timeline... maybe.
* The death of the mother ''TyrannosaurusRex''. Even Nigel seemed shaken by that.