If humans and dinosaurs coexisted today, it would have a significant impact on the environment and ecosystems. Some say that humans would never have evolved if dinosaurs had not become extinct

Here are some other things that might happen if humans and dinosaurs coexisted:

• Decreased population: The number of humans, animals, and plant species would decrease because dinosaurs would eat them. 
• Domesticated dinosaurs: Humans might domesticate some dinosaurs, like turkeys and chickens, and use them as a food source. 
• Human-dinosaur conflict: Adult raptors, like Utahraptor and Deinonychus, could easily kill humans. According to Farke, humans would probably have been able to coexist with dinosaurs because humans evolved in ecosystems that had large land animals and predators. 

If we speculate that humans had evolved alongside dinosaurs, then they probably would have been able to co-exist,” says Farke. “Humans already evolved in ecosystems that had large land animals and predators. We probably would have done okay.”

Some say it’s unlikely that humans would have evolved if dinosaurs hadn’t gone extinct

According to Homework.Study.com, the environment at the time of the dinosaurs wasn’t conducive to the evolution of large warm-blooded mammals like humans. However, when conditions on Earth changed, mammals evolved to be larger and eventually humans came about. 

Dinosaurs and mammals evolved around the same time, and dinosaurs dominated during that period. Humans and dinosaurs never met, as dinosaurs had been extinct for about 62 million years by the time modern humans began to roam the planet

They would still probably be small, scrawny, and very generalized. But instead, the mammals were able to evolve and diversify and, well, ultimately, millions of years later, become some humans. So perhaps we would not have been here if it weren’t for this extinction event 65 million years ago

According to the Museum of Science, Boston, dinosaurs would likely still be small, scrawny, and generalized if they hadn’t gone extinct. However, ndtv.com says that dinosaurs would likely still have been supergiant, long-necked herbivores and huge tyrannosaur-like predators

Birds are the only dinosaurs that survived the mass extinction event 65 million years ago. Some say that early dinosaurs from the Triassic period would likely be comfortable running around today because the current atmosphere has about 21 percent oxygen

There’s little about 100 million years of dinosaur history to hint they’d have done anything radically different if the asteroid hadn’t intervened. We’d likely still have those supergiant, long-necked herbivores, and huge tyrannosaur-like predators

Evolution is essentially chaotic (in the technical sense) and is driven by accidental mutation and accidental matings (both driving randomness) and natural selection weakly selecting each of the new genomes created by random mutations and random egg-meets-sperm events. This goes on over millions of generations.

Natural selection will still result in highly adapted organisms and may well produce intelligence, but it would be very unlikely to look much like us and certainly would not be human in the biological sense of being interfertile.

Would intelligence in any form evolve on a dinosaur-dominated planet? Hard to say because we don’t really understand how intelligence evolves or how likely it is to evolve. The evidence is that in our sample of one, it has evolved once in the last hundred million years. This allows us to make a (weak) estimate of intelligence taking on average 100,000,000 years to evolve with huge uncertainty. (Not a good estimate, but it’s an estimate based on actual evidence rather than speculation.)

On the more speculative side, we think that social animals are more likely to evolve intelligence. (Basically, that we evolved intelligence because we lived in troops which started out looking a lot like modern baboon troops, with intense social interaction. We evolved intelligence because it allowed us to lie better and to gain higher social position in the troop.

So look for whatever ultimately evolves to come from a social animal.

If dinosaurs hadn’t gone extinct, evolution would have taken a different path. Dinosaurs would likely still be giant, long-necked herbivores and huge, two-legged carnivores

Here are some other things that might have happened if dinosaurs hadn’t gone extinct:

• Dinosaurs would dominate Dinosaurs would likely still be thriving today, as they thrived for millions of years by being bigger and stronger, not more intelligent. 
• Humans would compete with dinosaurs Humans and dinosaurs might live in peace, but they would compete with each other. For example, dinosaurs might take over more physically demanding jobs like laborers and security guards. 
• Humans would need to keep up Humans would need to figure out a way to keep up with the dinosaurs, who would have better advantages. 
• Flowering plants would still dominate After the dinosaurs’ extinction, flowering plants continued to dominate Earth, and continue to do so today. 

According to a Quora user, a T-rex would likely be mesmerized by a human’s appearance, and would be mindful of the presence of another animal. Unless it was territorial or very hungry, it’s unlikely to attack immediately

Dinosaurs continued to get more diverse over time, but behaviorally they were probably not that different. Generally, their reaction to humans would be based on niche. Small herbivores would likely mostly avoid us. Unknown, large animals are potential predators

Humans and dinosaurs never met, as dinosaurs had been extinct for about 62 million years by the time modern humans began to roam the planet. However, some say that humans would have hunted dinosaurs to extinction if they had survived

According to the BBC, humans’ population growth and hunting technologies would have taken a toll on big dinosaurs as they spread across the globe. Arbour says that humans are really good at extinguishing megafauna through hunting, climate change, or habitat destruction. 

One Reddit user says that it’s likely that after thousands of years, T.Rex would be hunted to extinction. The user says that humans would have employed a coordinated effort in great numbers. 

However, another user doubts that humans would actually hunt dinosaurs because killing one would then force them to defend the carcass against more dinosaurs. The user thinks that humans would be scavengers who also hunted smaller animals. 

Dinosaurs likely made sounds that were too low-frequency for humans to hear. However, the vibrations from their sounds would have been felt

Dinosaurs may have made sounds similar to birds, such as the coo of a pigeon or the mumble of an ostrich. These sounds may have been low, throaty whooshes of air. 

Scientists have a hard time reconstructing what dinosaurs sounded like because vocal organs are made of soft tissue and don’t fossilize like bones do. 

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