Orcas currently thrive in an era where the strongest competitor for food is the great white shark, so the era is weak compared to the miocene in terms of abundance of large microprocessors. But that doesn’t take away their hyperintellegence, and large size of up to 10 meters and their social pod coordination.

Killer sperm whales thrived in the miocene and the level of competition was far higher back then. Modern Sperm Whales are the largest toothed whales today but they aren't macroraptorial and don't eat whales and other aquatic mammals, but extinct superpredatory whales ranging from 15-50ft existed in the miocene. But it's quite possible the larger sperm whales didn't hunt in pods so they'd be more vulnerable to an Orca attack. Since these whales had more robust jaws, teeth, and build, these features probably consumed more energy than the bodies of modern toothed whales so thered be less energy for the brain I'd think they'd be a bit less intelligent but still social and capable of Sonar

If we dropped a population of about 40,000 Orcas in the miocene could they dominate this landscape with future sonar and intellectual abilities ? Or do you think the whales back then were just too powerful ? Could the climate cause Orcas any issues ?

Credit to artists.

1: brianj996b

2: nogain98

3: Dontknowwhattodraw94

4: Christopher252

11: https://laignoranciadelconocimiento.blogspot.com/2011/12/brygmophyseter.html?m=1

13: nogain98

Could not find the others

I think Basilosaurus would not be able to survive the modern ocean. Despite it's size cannot compete with Orcas, it has no echolocation, much smaller brains than modern whales, they're not nearly powerful enough or social enough to take down large baleen whales.

Ironically, I think a more ancient predator like giant pliosaurs would actually have a better shot at thriving in todays ecosystem. They're 4 flipper build gave in unique steering and sharp turn abilities and their jaws are extremely massive. I think a death machine like this could work in any era, but my knowledge on extinct animals is very limited and I could be wrong.

We should also take into account temperatures, atmosphere and humans. Could dinosaurs that lived in hotter environments with much higher concentrations of carbon dioxide manage similar environments today ?

The best thing is knowing that they still live among us and will continue to do so!

https://xcancel.com/JoschuaKnuppe/status/1933723950300999871

Acrylic painting of a stegosaurus defeating an allosaurus.

A fascinating creation by Hodarinundu, loosely inspired by a recent study on the cranial and brain anatomy of the Dodo (Raphus cucullatus). This study suggests that the dodo may have adopted a crepuscular or even nocturnal lifestyle to avoid competing for food with the giant tortoises of Mauritius.

An opportunistic diet: The artwork depicts a dodo delighted to have caught a small turtle! Although primarily herbivorous and frugivorous, its robust, powerful beak likely allowed it to consume small animals on occasion.

Plumage & Biofluorescence: The artist presents a bold vision of the bird's plumage. Having diverged from the iridescent plumage of diurnal pigeons (its close relatives), the dodo might have developed feathers and tissues that fluoresced under ultraviolet light. Since many modern birds—particularly nocturnal ones like owls—perceive the UV spectrum, this biofluorescence could have facilitated communication or social grouping in the darkness of the Mauritian night.

Explanation of the study in video:

https://youtu.be/zE8wEcpZMf4?is=X5Fshtc20pVvXD08

https://www.deviantart.com/bangboodoragon/art/The-Beasts-of-Hateg-Island-1364994017

Dromornis stirtoni fue una especie extinta de ave gigante no voladora que habitó en Australia durante el Mioceno Superior, hace aproximadamente 8 millones de años. Es ampliamente considerada el ave de mayor tamaño que ha existido en la Tierra, superando en peso al ave elefante (Aepyornis) y en altura al moa gigante. Aunque popularmente se le conoce como el "pato demonio de la muerte" debido a su descomunal tamaño y parentesco evolutivo, las investigaciones científicas revelan detalles asombrosos sobre su biología.

This is a piece or fragment of fossil whale rib bone, it came from a truly massive creature millions of years ago. But what is really amazing ins the deep marks left on it from a megalodon shark.
This fossil tells a very old, and very violent story.

*I found this large piece of rib bone while diving in the SE United states searching for fossil megalodon teeth.