Never get caught in a ditch in the rain while trying to free your jeep from the mud. They will find you, spit at you, and then eat you.

First playing ARK:
"OH SHIT A DILO RUN"

100 in game days later:
"Dafuq is this piece of shit trying to do"
*Rex murders it and it's family*

Should start taming these as they are the technically the first dino in the kibble chain.

When you go to tame one, make sure they aren't in a pack. They may not seem that intimidating, but in a small pack, they are very dangerous.