The differences in feeding preferences lead, in turn, to differences in migratory habits.
2
你可以获得足够的蛋白质,甚至在你吃晚饭之前就能达到推荐的日摄食量。
You can get enough protein and meet the RDA before you even get to dinner.
3
生存的斗争并不发生在这种争斗中,而是为了争夺有限的摄食区域,以及为了争夺没有食肉动物的领地。
The struggle for existence occurs not in such fights, but in the competition for limited feeding areas and for the occupancy of areas free from meat-eating animals.