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.
B. YOUR NOTES ARE MESSY BECAUSE YOUR WRITING TOO QUICKLY
George explains to Slim how Lennie followed his instructions and trusted him every time and how he teased Lennie that he was “too dumb even to know he had a joke played on him.” Which gave him fun. The teasing came to an end when Lennie trusted George and agrees to jump in the river, where he almost drowned, “He near drowned before we could get him. An’ he was so nice to me for pulling him out. Clean forgot I told him to jump in.”, realizing how much power he had over Lennie and resolve to never tease him over his trust.
