obsolete material target of observation true A bird observed during a Christmas Bird Count A material entity that has a target of observation role, that is, a material entity that is the input of some observing process. Biocode Commons Ontology Hackathon A bird observed during a transect walk. An lizard observed in the field that is not collected but whose location is recorded in a field notebook. This term was made obsolete because of incorrected identifier format. It is replaced by BCO_0000044. A tree is forest plot that is measured for diameter at breast height (DBH). Obsolete Class incorrect identifier format, replaced