Hi! I found a similar question asked on Quora phrased as "Why don't we see animals undergoing evolution today?", so the top answer there might help you:

Many other answers here answer the main question already -  I will speak to your question detail, and all the implicit assumptions embedded in the simple question: "why don't we see monkeys learning to walk upright?" Which to me implies that humans are some sort of evolutionary "ideal" and other species should be converging on our state.We didn't evolve from monkeys. .We evolved from the same common ancestor as apes and other primates. .So modern day apes are just as evolved as we are from our comon ancestor.

We are separate successful species off the same branch. .Many other species along this same ancestoral branch were not so successful like the Neanderthal and they died out.Other primates have a less heavy skull relative to their body so they don't need to walk upright.You have a bigger brain, which is where our species has been evolved to expend more of our calories.Apes have bigger upper body muscles.

So an ape can't do math as well as us, but try getting into a bareknuckle brawl with a gorilla or chimpanzee and see who is more "evolved".Whales are not more evolved than plankton, even though its higher on the food chain. .Whales are more complex, sure but complexity isn't the "goal" of evolution, which has no goal.A whale can eat thousands of tons of plankton in its lifetime, and yet there is still more biomass as plankton than whales because plankton have evolved to reproduce at an astounding rate.Evolution is a random process whereby the outcome is not random because of natural selection. .So most evolutionary outcomes are deleted, and the ones most adapted for survival are kept.You might think humans are the most "advanced" because we are the most intelligent.

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