From A Monarch Butterfly's Life (Children's Press)

Monarch laying eggs on Common Milkweed.

Also in picture: Bobolink & Milkweed Tussock Moth caterpillars.

Monarch  caterpillar searching for place to complete metamorphosis.

Also in picture: Milkweed Bug , Common Milkweed & Herring Gulls.

Monarchs

gathering in the millions in Mexico.