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This glossary explains common terms you will encounter in the tarantula hobby. It is designed as a practical reference for keepers, whether you are just starting out or have been around long enough to argue about substrate mixes. This glossary will be updated regularly! A AbdomenThe rear body segment of a tarantula. It contains vital organs and is the most fragile part of the spider. ArborealA tarantula species that lives primarily in trees and elevated structures rather than on the ground. Some arboreal species (e.g. Phormingochilus sp.) do tend to burrow as slings. Autotomy (Appendotomy)The ability of a tarantula to voluntarily drop an appendage as a response to stress, defense or injury. B Book LungsRespiratory organs located on the underside of the abdomen. Tarantulas have two pairs of book lungs. BurrowerA tarantula that spends most of its time underground, often sealing itself in during pre-molt. In the hobby they are …