There are hairy crabs, mud crabs, tree crabs.

LULU：有大闸蟹、泥蟹、树蟹。

So to actually build this crab family tree, they're not taking photos and scrapbooking,   they're taking DNA. They sequenced the DNA from hundreds of different crabs.

露露：所以为了真正建立这个螃蟹家谱，他们不是拍照和剪贴簿，而是采集 DNA。他们对数百种不同螃蟹的 DNA 进行了测序。