Olfactory Bulb Ratio, ORs Gene Repertoire, and Olfactory Ability
1.Olfactory Bulb的生物学意义：a.生存 b.嗅觉能力
2.Olfactory Bulb Ratio与嗅觉能力成正比
基于以上table得到线性相关图：
a.解释nomoral值：
b.解释outlier：
而该统计中的outlier物种则是快速进化的example（因为观察chicken, zebra finch, and budgerigar可知其特点（快速进化））
4.发现并解释decreased OBRs
发现： passerine birds (excluding zebra finch) and psittaciformes (excluding budgerigar) have the least number of OR genes.（data）
解释：This could be due to the increased cognitive abilities of birds in these orders such as the capacity for vocal learning（biology）
5.不同order的鸟OBR比较
distinct evolutionary pressures that drove the rapid diversification of the rapidly expanded paralogs of these species
6.不同活动鸟比较OBR，与生活习性相联系
