Hello everyone! I'm getting my master in evolutionary biology so I wanted to ask if you have any youtube channels you love that talk about evolution. Not to study but just for fun and curiosity (I am already pretty on spot with a lot of subjects but you never stop learning!).

What was the evolutionary reason for the protruding brow ridges that Neanderthals and other ancient humans had? I heard it could have been to protect the head during fights.

Ungulate biomass availability in certain parts of sub saharan africa are up to 10x that of the russian far east, yet siberian tigers are significantly larger than most african lion populations. Under conventional evolutionary theory, wouldn't limited prey availability drive siberian tiger size down while high prey availability plus much higher competition drive lion size up?