Earlier springs can disrupt animal migration, breeding, and hibernation cycles, which can have negative consequences for species survival. For example, if birds migrate north too early, they may find that their food sources have not yet arrived, which can lead to starvation. Similarly, if bears come out of hibernation too early, they may find that there is not enough food available, which can also lead to starvation. In addition, earlier springs can also lead to changes in plant growth and flowering times, which can have negative consequences for pollinators such as bees and butterflies.