"When you're there, you know, picking them(dead birds) up off the ground and seeing the extent of it and then looking at all these carcasses come in,"

这句话的背景是在美国发现了大量未知原因的鸟类死尸，一名去过现场的学者做的评论。

句中的looking at后是一个宾语从句吗？come in是谓语动词吗？

希望老师解惑，谢谢！