What Do Butterfly Eggs Look Like? The eggs and egg-laying habits of butterflies are as varied as they are. Some lay eggs individually on the undersides of leaves; others on the top sides.

What do spotted lanternfly and spongy moth eggs look like? The USDA says that spotted lanternfly egg masses are "flat" and "mud-like," and can have between 30 and 50 eggs.

We didn’t see any adults the day we searched, just the caterpillar. Paul Smith’s VIC in New York’s North Country has a 30-year-old butterfly house that keeps an eye on monarchs as well.