In general less bulgy species can be easily kept together in one cage, but not all kinds of species should be kept together due to the size difference being to immense. Followingly, small or very fragile species should never be kept in one and the same cage with very large and bulgy species like e.g. Heteropteryx, Haaniella or Eurycantha. These may seriously harm and injure the more weak and soft-bodied insects with their spines and claws or may even nibble their antennae 6 verschiedene Arten and legs.
Furthermore, living-leafes (Phyllium) should be kept in own cages and separate from other phasmids. Due to their almost perfect camouflage they may easily be mistaken for leaves of the foodplant which causes that the abdomen is often mistakenly eaten by their co-inhabitants. This problem can also arise when too many Phyllium are kept in one cage. Very large species like e.g. Phobaeticus serratipes but also smaller and more fragile phasmids like e.g. species of Lopaphus or Pseudodiacantha macklottii show a strong tendency to lose legs if too many specimens are kept together in one cage.
Also species which are able to spray a strongly smelling and corrosive secretion from defensive glands on the anterior angles of the prothorax, like e.g. species of Anisomorpha or Pseudophasma, should be kept separate from other species, as the secretion may harm other co-inhabitants.
Depending on the climate and natural environment at the origin of the corresponding culture-stock, species from tropical regions which prefer a humid atmosphere should not be kept together with species from more dry habitats. This also concerns to the temperature.