This is a monarch butterfly’s egg. The egg
is cone-shaped, ribbed and as tiny as a pinhead. At average summer temperatures it takes the
caterpillar 4 or 5 days to grow inside the egg. They are ready to hatch when you see
a black dot at the top of the egg. The black dot is the head of the caterpillar inside.
The caterpillar chews a hole in its eggshell through which to crawl out.