We visualize simulations of evolving populations with two traits by displaying individual organisms in two-dimensional fitness landscapes. We explore three phenomena in evolutionary dynamics that can be difficult to comprehend. First we show dynamic landscapes with two fluctuating peaks in which the population track the peaks as they appear at difference locations in phenotype space. We then demonstrate negative density-dependent selection, which causes the population to split into distinct subpopulations located on separate peaks, illustrating how speciation can occur in sympatry. Lastly, we show the survival of the flattest where the population prefers a tall narrow peak at low mutation rate, but moves to the lower but wider plateau at high mutation rate.