For some basic biology on butterflies, check out a previous post here.
Monarch butterflies have a long distance migration where they spend the winter in Mexico.
Milkweed is the Monarch's host plant - that means that as caterpillars, they eat only milkweed. This makes them taste bitter which is why they have such bright coloration. This bright coloration tells birds - Don't eat me, I taste bad!
There will be lots more butterfly fun all week - so keep coming back!