I apologize if my previous responses were unclear or confusing. Let me provide some more context about solitary bees and bee hotels:

Solitary bees, unlike social bees such as honey bees, do not live in colonies. Instead, female solitary bees construct individual nests, often in tunnels or cavities, where they lay eggs and care for their larvae alone. Many solitary bees nest in abandoned insect tunnels in wood or pithy plant stems. However, as suitable nesting sites have become scarcer, bee hotels have been developed to provide nesting structures for these important pollinators.

The life cycle of a solitary bee consists of four stages: egg, larva, pupa, and adult. Female solitary bees lay eggs in their nest, and the eggs hatch into larvae, which feed on nectar and pollen provided by the female bee. The larvae eventually spin cocoons and undergo complete metamorphosis into adults. In order to complete their life cycle, solitary bees require access to their entire nest. If the nest is blocked or inaccessible, the larvae may not receive adequate food and care, and the adults will not be able to emerge.

Therefore, bee hotels should be designed to provide solitary bees with safe and accessible nesting structures that enable them to complete their life cycle. Removable back walls or divisions between nesting tubes allow for proper inspection and cleaning of the hotel. They also provide access to nesting tunnels in case the adult bees are unable to emerge on their own. Does this help clarify why a non-removable back wall is not ideal for a bee hotel? Please let me know if you have any other questions!
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