Ultimately, it is indeed in the 'eye of the beholder', and personal choice, as it is we who perform the action. The choice is dependant upon the line in the head, which is dependant upon how we view the world. There are still objective factors such as brain-size, potential longevity, presense of vocal chorts, and, perhaps a measure of 'biological complexity'. Granted, these are often thrown to the wind when it comes to evaluating a 'potentially fun feeder', but people that do that are either stupid, or are aware that they are walking one one end of a line.CopperInMyVeins said:My point is, which animal is a good pet, and which is just a feeder animal for your pets is in the eye of the beholder. Some people feed fish, lizards, rodents, even birds to invertebrate pets, and in all those cases, someone could argue that vertebrates are "higher" or "more complex" just as you did with the tarantula and roach. it all comes down to personal choice though, I'm sure there are some people out there who would rather keep a colony of Blaberus than a tarantula.