The video about the barnacle geese taught me that some animals need a good start to be a strong species. The barnacle goose's first test is when it has to jump off of a cliff to get to food below. This shows me that animals don't necessarily need the best DNA, but if you have a good start like this animal you will do better in the wild.
This animal showed me that sometimes only the strong survive long enough to have offspring and they have to be skilled in finding food, shelter and water. This animal despite its appearance as a small pup is strong enough to survive where many fully grown animals would not.