1. Crickets belong to a family, including more than 2000 species of various organisms. Arthropoda-Insect Steel-Orthoptera-Cricket Family is usually raised as singing insects, cricket fighting and feed. Common crickets are: cricket fighting (China cricket fighting); Oil gourd (Sinonovacula bambusa is also a kind of oil gourd), Sinonovacula bimaculata.

2. Octopus, commonly known as an insect, belongs to Arthropoda-Insecta-Orthoptera-Tettigonidae-Chimonanthaceae. Often raised as songbirds.

3. The genus Vega belongs to Arthropoda-Insecta-Orthoptera-Tettigonioidea-Vega. A pine caterpillar.

None of the creatures you mentioned are animals. Crickets often mentioned are Mica cricket (China cricket, the most commonly kept) and double-spotted cricket (as cricket and feed). There are many kinds of crickets often mentioned, but they all look alike. Common weavers are Japanese weavers and China long-winged weavers.