Hungry, Hungry Dinos is an achievement in Plants vs. Zombies 2. It is achieved by letting T. Rexes chomp at least ten zombies in a level. It is worth 5 points on Game Center and 500 XP on Google Play Games for Android devices.
Its name is a portmanteau of Hungry Hungry Hippos, a game made by Hasbro and "dinosaurs," referring to the T. Rexes needed to get this achievement.
Since T. Rex will disappear after roaring, it is good to time a level to know when and which lanes the T. Rex will appear to charm it. Using an Imitater in conjunction with a Perfume-shroom will ensure it is ready to use immediately or time it to recharge before the dinosaur roars. The T-Rex will not roar if the zombies are eating a plant on the first tile, so the player can block zombies from entering and making the T-Rex roar this way. If T. Rex roars before charming, the zombies may be too fast so delay them with wall-type or any cheap plant. You can also use Garlic or Sweet Potato to put more zombies in the charmed T. Rex's lane.