I am speaking on behalf of Grove Street Games and Dan Leveille. At the top of the screen you should see a dinosaur name. Right now it is the Achatina. If you click on it, you can select from 198 dinosaurs to choose from and see their information (like amount of items necessary to tame, weapons sufficient to knock out, items to keep them unconscious, their stats, type of food to tame, size to fit through openings, type of trap to restrain them, and types of buildings they can destroy. On the top-right of the screen, you can adjust the dinosaur level. This will alter the sufficient shots from weapons to tame them, the amount of items needed to keep a dino knocked out, their stats, and the amount of food that you need to tame them with. In the menu you can choose from different features (maps, resources, recipes, dinos, etc...)
They worth the veggie cake. It gives 100 paste and organic polymer. Just level up their food so they won't be hungry fast.
I have 2 bee hives and 7 tree sap taps (important to make veggie cakes). I can produce more cakes than what my 2 achatina can consume at a time. Now, I never run out of paste and have a lot of veggie cakes (I needed separate refrigerator just for my cakes)
If you are considering breeding these, go slam your hand in a car door a few times. It will be much less painful. Literally one veggie cake per percent of growth....and it grows slow.. Digests roughly one point of food per second, so feed a cake about one for every 7 mins (during event boost) and it will gain one percent of growth.
If you want to tame it on a swap, but you're afraid that you will get sneak attacked by any of the 3 horseman of the swamp, just kidnap it with a preta and land it near your base, then you tame it without many troubles.