The female butterfly lays her eggs on the leaves of the swan plant. She often lays her eggs on the underside of the leaf to keep them safer.
She places the end of her abdomen on the leaf and pushes out the egg. It sticks to the leaf with a special kind of glue, so it doesn’t fall off, even in the rain.
Monarch butterfly eggs are tiny – only about 1mm wide.
A tiny caterpillar grows inside the egg. It takes about 4 to 10 days before the caterpillar hatches out of the egg. How long it takes mostly depends on the weather – the warmer it is, the shorter time it takes.