They only eat milkweed as larvae.

它们只吃的幼。

The problem is there are different types of milkweed.

问题有很多种类。

Decker say these findings are not just about butterflies and milkweed.

德克尔表示，这些发现不与蝴蝶和马利筋有关。

In other words, what these females are doing is they're laying 68 percent of their eggs in the medicinal milkweed.

换句话说雌蝶把 68％ 的卵产上。

Drier weather in the U.S. West, driven by climate change, means less milkweed for butterflies to eat, Wagner said.

瓦格纳说，受气候变化影响，美国西部气候更加干燥，这意味着可供蝴蝶食用的减少。

So people are planting milkweed all over the country where we have lost milkweed due to habitat destruction, pesticide use, herbicide use and climate change impacts.

全国各地因生态环境破坏、杀虫剂、除剂、气候变化影响而失去的地方，人们都种植。