Bluebird have adapted to use man made boxes for nesting. Their ready acceptance of the man made home has lead to a very successful conservation effort.
Grass, twigs and moss and other materials suitable for a nest.
NO!
A birdhouse is typically a small, enclosed structure designed to provide shelter and nesting space for birds. It usually features a front entrance hole, ventilation openings, and drainage holes to protect the inhabitants from the elements. Birdhouses can be made from various materials, such as wood or metal, and come in various designs to accommodate different bird species. Overall, they serve as artificial nesting sites to support bird populations.
Nesting dolls
No, a leaf is not a frame structure. A leaf is a plant organ that is adapted for photosynthesis, gas exchange, and transpiration. Frame structures are made of interconnected members that support loads and resist forces in structures like buildings or bridges.
Check the related link for Matryoshka and find the values.
modified, personalized, custom-made, made to order
A tree. A Russian Nesting doll is made of wood.
purple martin
yes
Pigeons have adapted to urban areas by exploiting human-made structures for nesting and roosting, such as buildings, bridges, and parks. Their diet has also shifted to include human food waste, making cities a reliable food source. Additionally, their strong homing instincts and ability to thrive in diverse environments have allowed them to flourish in urban settings. These adaptations have contributed to their status as one of the most successful bird species in cities worldwide.
They make nests of dry grasses in bird houses or other natural or man-made cavities. This could be a hole in a tree.