Flue slope. Question-I've seen this type of venting 3-4 times a month in older houses and never had anyone complain. The bottom metal flue is the 80% furnace with an uphill rise from it to the newly lined masonry chimney (stainless steel liner).
Monarch butterflies utilize different habitat in the warm months versus the cold months. In the spring, summer and early fall, they can be found wherever there are milkweeds. Monarchs lay their eggs on milkweeds and they're always searching for them in fields, meadows and parks.
2 - The migration of the Monarch butterfly. It's possible to find a few butterfly species straying into city parks and gardens, investigating weedy areas of wasteland or flying in other 'unnatural' habitats, but despite such apparently cosmopolitan lifestyles butterflies are extremely choosy about where they lay their eggs.