Dr. PERSON@1 -LRB- Australian ORGANIZATION@1 -RRB- has argued that the need for nest boxes indicates that logging practices are not ecologically sustainable , for conserving hollow-dependent species like PERSON@2 's possum .

Dr. PERSON@1 , -LRB- Australian ORGANIZATION@1 -RRB- , has said that the need to make nest boxes showed that logging was removing too many older trees with hollows needed by species like PERSON@2 's Possum .
