Hamsters have no relatives, it is difficult to cultivate feelings, and sometimes they bite people, and they are solitary animals. Keeping them in cages has a high probability of cannibalism, which has a shadow on students' psychology and is not convenient to take out to play. Hamsters are too small to observe their health, and once they escape from prison, it is difficult to find out where to drill.

The relatives of the cuttlefish are highly interactive, can climb their shoulders, and can be taken out to play. Moreover, the cuttlefish is a gregarious animal, very friendly to the same kind, and even suffers from depression because of loneliness. The striped mouse is large, lively, easy to observe the health status, and less likely to find it under the sofa.