This is survival of the fittest
Reference to Charles Darwins' survival of the fittest : He wants to be the best rapper so he is challenging every other rapper, and only the best rapper will still have a career after this is over. Matches very well with the animal references later in verse one, even more with the ruffling feathers line.
The term Survival of the Fittest was actually coined by English polymath Herbert Spencer, who came up with the idea after reading Darwin’s work. Survival of the Fittest extends the idea of natural selection beyond the animal kingdom.
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