Apex Predators.

After doing a little bit of research i came across an 'Apex Predator'.

Apex Predators, also referred to as the alpha, super or top predator, are predators with no predators of their own, residing at the top of their food chain. Zoologists define predation as the killing and consumption of another organism (which generally excludes parasites and most bacteria).

Using this information i would like to explore the major eco systems on earth and hope to the top 1 / 2 Apex predators from these ecosystems to form my top 10 Apex predators of our planet.

I would also like to explore the Apex predators of the pre-historic world as i can image our predators would be nothing compared to them.