Some of the more recent ones from Jurassic Park sets are likely found within the Brick Instruction App. You can try to search (or ask) for them here (looking up the part numbers would be recommended):
https://forums.ldraw.org/thread-27738.html
Note that these will be the raw unprinted ones (patterns need to be authored by someone).
Some of the larger Dino Attack/Dino 2010 ones will be hard to get. These are too old for the Brick Instruction App and were absent from LDD, so no raw meshes available unfortunately. I guess the smallest one is there though.
https://forums.ldraw.org/thread-27738.html
Note that these will be the raw unprinted ones (patterns need to be authored by someone).
Some of the larger Dino Attack/Dino 2010 ones will be hard to get. These are too old for the Brick Instruction App and were absent from LDD, so no raw meshes available unfortunately. I guess the smallest one is there though.