Students who are a bit busy with their studies but would like to have a pet to relieve their stress can consider the following kinds of pets:
1. **Cats**: Cats are great choices, they don't need too much exercise, they don't need to be bathed and groomed often, and they are very affectionate, so they can accompany their owners. In addition, owning a cat doesn't require much financial investment, just some basic cat food and cat litter.
2. **Hamster**: Hamster is also a suitable pet for student party, they don't need too much space and care, just need to provide some basic feed and water. Moreover, they are small and cute, which is perfect for relaxing after a stressful day of study.
3. **Small Fish**: If you like the world of aquariums, you can consider raising some small fish, such as tropical fish and goldfish. These fish do not require much space and care, but can add some fun to life.
4. **Birds**: If you like birds, consider keeping some small birds such as parrots and canaries. These birds require some space and care, but can add a lot of fun and interaction to life.
It is important to note that keeping a pet requires a certain amount of time and effort, as well as some basic supplies such as a cage, food bowl, water bowl, toys and so on. If you really don't have enough time and energy to take care of your pet, it is recommended to consider other forms of entertainment. At the same time, when choosing a pet, it is also necessary to take into account your actual situation and preferences, and choose the right pet for you.