Having a more varied diet for more of the existing species in the game. Here are some examples of existing species that could have varied diets based on paleo studies.
Species that can have an expanded diet and eat from the fish feeder
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Species that can eat from the insect feeder
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Carnivores/ Piscavores that could also be herbivorous.
Explore Troodon, an omnivorous theropod dinosaur in the Dino Directory.
www.nhm.ac.uk
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To be honest, out of all the species that really need a rework, Troodon is one that definitely needs it. If gets added in Jurassic World Evolution 3, I think the developers should make some changes to make it more realistic. Some changes that may help do that include:
-making it a feathered species or making a feathered variant of it
-make it nonvenomous species (The only dinosaur that was ever suspected being venomous is Sinornithosaurus.)
-consider making a variant of it that is larger in size to represent the larger ones found in Alaska
It should be noted that Troodon is only known fossils of its teeth, meaning it's appearance like has been interpreted based mostly on what its relatives looked like and the imaginations of the developers. Since the developers added a bunch of different raptor species into the game, I think it would be nice if in the next game the developers added more Troodontid species into the game. Some Troodontid species I would recommend include:
Hesperornithoides, A genus of troodontid theropod dinosaur that lived in North America during the Late Jurassic period. It was discovered accidentally in Jimbo Quarry of the Morrison Formation, overlying the excavation site of Supersaurus vivianae, near Douglas, Wyoming. The accidental discovery of the skeleton led to some of the fossils being damaged or lost. It grew to be around 1 meter (3.3 feet) long. The generic name is derived from the Greek Ἑσπερίς, Hesperis, "western", ὄρνις, ornis, "bird", and ~eides, "form". The specific name honours the Miessler family for its support of the project. It is also known by the nickname Lori. It is believed to have lived in a wetland environment. I do think if it gets added that developers should make it a feathered species.
Mei long, A species of duck-sized troodontid dinosaur that was first unearthed by paleontologists from the Yixian Formation in Liaoning, China in 2004. Mei lived during the Early Cretaceous period. Its name means sleeping dragon. It is believed to have fed on small lizards and insects on the forest floor. Researchers believe it may have been able climb trees in order avoid large predators. I suspect the unidentified troodontid species shown in an episode of prehistoric park that took place prehistoric China were this species, because Nigel Marvin said their name meant sleeping dragon.
Latenivenatrix, a genus of large troodontid from the late Cretaceous period found in the Dinosaur Park Formation strata from Alberta, Canada. It grew to between 3–3.5 meters (9.8–11.5 ft.) long. Latenivenatrix is the largest troodontid known. Its name means hiding huntress.
Almas, A genus of troodontid theropod dinosaur from the late Cretaceous period that was found in the Djadochta Formation in Mongolia. The generic name refers to the almas, "wild man" in Mongolian, a man-like creature from Mongolian folklore. The specific name refers to its provenance.
Gobivenator, An extinct genus of troodontid theropod dinosaur known from the Djadokhta Formation of central Gobi Desert, Mongolia. It is known from a single specimen, which represents the most complete specimen of a Late Cretaceous troodontid currently known. It grew to be around 1.7 meters (5.6 ft.) long and weighing 9 kilograms (20 lbs.). The generic name is derived from the name of the Gobi Desert, where the holotype was found, and venator meaning "hunter" in Latin. The specific name refers to its occurrence in Mongolia, as the Latin suffix -ensis means "from".
Also, according to Wikipedia, Dimetrodon is believed to have spent most of its time on land or in shallow water but is suspected of eating fish. I'll post the link to article here:
https://en.wikipedia.org/wiki/Dimetrodon#Food_web
I will mention that a relative of Dimetrodon, known as Secodontosaurus is believed to have specialized in catching fish or for hunting prey that lived or hid in burrows or crevices.