Are big green caterpillars in Maryland poisonous?

In Maryland, many large green caterpillars are not poisonous but can be unpalatable or cause mild irritation if handled. Some species, like the Tomato Hornworm, are harmless, while others, such as the Lonomia obliqua, can be dangerous. It's essential to identify the specific caterpillar before handling, as some may have defensive mechanisms or toxins. Always exercise caution when encountering unfamiliar insects.