It takes courage to achieve something because you have to start it in the first place.
What if you had to jump off a diving board from a high level to win a bet? Or maybe sing or give a speech in front of a huge crowd if you were afraid of speaking in public? Getting good grades, graduating, asking a crush out.
All of these things are possible to accomplish, yet you need courage to achieve them because it’s scary to start if you’re afraid you might fail. You need courage to achieve them because of how hard it may get in the process.
A few would be maybe a change in mating? Like if the animal isn't leaving it's habitat to go and get nutrition and mate then something might be off with the animal, or the seasons are messing them up due to weather.
Another would be possibly be animals who usually don't go into competition, going into it with animals that are usually in a good zone, most likely due to food dropping or habitat population increase.
And then there's invasive species, they come in and kill off animal species causing a whole environmental habitat of animals to die off, eat their food and take in all the nutrients, and then possibly animals having to go off and find a new habitat causing them to become invasive species.
