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Johnson said the new regulations are a good way to educate people about the harm from invasive species but might not be enough to stem the loss of native species, such as the spicebush swallowtail butterfly or the state’s wildflowers.

This spicebush swallowtail caterpillar is in disguise as something much scarier: Birds pass it up as a snack because to them, these fake-eyed mimics look like snakes or treefrogs.

This spicebush swallowtail caterpillar is in disguise as something much scarier: Birds pass it up as a snack because to them, these fake-eyed mimics look like snakes or treefrogs.

This spicebush swallowtail caterpillar is in disguise as something much scarier: Birds pass it up as a snack because to them, these fake-eyed mimics look like snakes or treefrogs.

A spicebush swallowtail crosses the trail, fast and fleeting, a blur of white outlining its dark wing.