1.   The research suggests that a similar pattern may apply to rarer species such as lapwings and redstarts.

2.   But the rarer species were not dropped from the plan.

3.   Collectors would pay hundreds of dollars for a pair of the rarer species, some protected by the Endangered Species Act and others by international convention.

4.   Nations could take steps to protect trees they have in abundance but fail to protect rarer species, Kessler said.