Assume that the life in question is similar to what appeared in the Mesozoic Era of Earth. What would be fundamental differences between their ecology and anatomy compared to Earth life, due to the increased gravity?
For context, the planet I am imagining is ~4 times the size of Earth and has ~3 times its gravity. Additionally it has Earth-like properties with the necessary atmospheric conditions for the Earth Mesozoic Era to occur.
Edit: That was too broad of a question and I have since reviewed the topic so to be specific I was worried about how things such as hunting and foraging by animals that evolved into miniaturised versions of the fauna seen on Earth (but not the exact same fauna), be affected?. Given that the implications of high-gravity Earth (HGE) fauna development encompass a wide range of variables, with Turner even suggesting the more likely mode of movement might be rolling or sliding, this question is still too broad.
I assume the plant life that succeeded on this planet would be similar to vines and bushes as they spread out along the ground gaining as much surface area to the sun, while lowering the pressure on itself by sticking close to the ground. However I imagine if trees did develop on this HGE they would not be too tall and have incredibly thick bases that were very stout.
So the question becomes: On land, would carnivores, herbivores or omnivores be more viable on a HGE given the increased metabolism requirements? Would plant life even bare fruit due to the increased energy requirements of high gravity (calling into question the validity of herbivores on land)?