I’m not entirely sure if this theory can be considered canon, but I think that the ammonite uses the pheromones as a psychological convincer to any random creature to defend it.
That’s just a theory, a GAME THEORY!!!

If you never seen one of these guys or even heard of them then my advice is don’t punch it.

They have a built in distress call, so if you attack it'll yell for help and like Every Single Ocean Creature will run to the rescue.

To the ammonites rescue, not to yours.

Ever met a cry baby?..This guy will wail if you hit it and will cover you in a type of pheromone gas....causing you to attract every dino, sea or land, to bite your butt. Prepare for war. You only need to survive 80sec.

When you find these hentai protagonits, get a good megalodon with a good Tek saddle. Then you can take them at a distance!

Basically the equivalent of the chicken in Skyrim, you hit it be ready for a big fight with the town

You touch the spaghetti, le spaghetti will not forghetti that you toucha the important ammonetti

My little sister found one of these near beach once, it said it didn’t want to be tamed. What a chicken

This thing is a crybaby. Hit it, and it'll go blubbering to all its friends. Exactly who are its friends? The whole ocean.

Clear out the area before attacking. If you don't a lot of things will get swarmed. It's better just to take them out 1 by 1.

This is the Justin Timberlake of the waters. Don't mess with it or get all the crazy fans coming after you(other sea creatures). If looking to kill, get rid of other sea creatures beforehand.

Prepare to fight every living thing in the ocean if you attack it

Can’t find a mosa or squid eh? Give one of these guys a punch and you’ll be sure to find one.

.me: Ammonite! Don't you dare cry! Ammonia:WAAAAA!!

Clear the area out before you take this dinosaur on

Yup....tried slapping it when I saw it for the first time, didn't know what it was.....

Then from nowhere 7 Megalodon, 4 Ichthyo, 6 Mantas, 3 Electros and a Dunkelotus appeared and banged me and my Bary.....Never mess with these, learned that a hard way😕

Mouth is sideways-lips and not a BEAK like a modern nautilus. Once again Wildcard ignores common logic!!

Yeah this is funny, but where teh freek do u find them?

Wat mosa cave thi annanomite did I spell it right?