Dinosaur Park: Big-Headed Bonus

When you purchase 100 Ammonites¹ or more, you'll get a big-headed Acrotholus (or, if you prefer, a Mirocetus or cyan Ankylosaurus) as a free bonus gift!
A large enough forest enclosure can sustain a herd of up to 12 Acrotholuses.
With a purchase of 200 Ammonites² or more, you can even get a pair of Acrotholuses for breeding; with purchases of 1000+ Ammonites³, you can opt to pick a VIP gift instead.
In the browser version of the game, you can also get a pair of your chosen VIP animal with purchases of 2500 Ammonites⁴ or more!
¹To receive a bonus gift, 100 Ammonites or more must be purchased in a single transaction. That means several smaller payments (ie. 2x 50 Ammonites) will not count.
For each payment of 100-199 Ammonites, you'll get one Ankylosaurus (Cyan) OR one Acrotholus OR one Mirocetus.
²A purchase of 200-999 Ammonites (pre-bulk bonus), will get you two Ankylosauruses (Cyan) OR two Acrotholus OR two Mirocetuses.
³With a purchase 1000 Ammonites (pre-bulk bonus), you'll have the option to receive one Dimetrodon (Robot) INSTEAD of two Ankylosauruses (Cyan)/Acrotholuses/Mirocetuses.
⁴With a purchase 2500 Ammonites (pre-bulk bonus, browser-only), you'll have the option to receive two Dimetrodons (Robot) INSTEAD of two Ankylosauruses (Cyan)/Acrotholuses/Mirocetuses.