Current science indicates that endangered species play a role through demise. In appropriating the reasons and effects of species that are downturning, we have to consider the part that habitation possibility plays in their trajectory. The spotted owl IS an owl, as is the barred owl. In avian mechanics and morphogenesis, it is not external appearance that is defining, it is field dynamics. In flight, birds communicate. Each movement that one member makes is 'sensed' by others, so that the collection navigates any happenstance that might cause injury.

In an open field, it is not buildings or trees that are risks, it is air/wind current shear. For bird species that live and subsist in vegetation of varying density, flight is accordingly executed, mainly for individually predisposed species. For low ambient light conditions, flight is randomly-sensed-moisture navigated.

It is possible that smaller wingspan birds ( even slightly so) downturn when this faculty is made redundant because of varying factors, including vegetation density alterations.

This means that one morphology-predominant bird replaces another with changing conditions. This is NOT evolution OR catastrophe, it is Morphology-Relational-Matching for organisms that sense temperature-moisture-ambient light(including nighttime contrasts) to subsist with changing conditions.

Cause                                                                                 Probable Basis                                                                             Weight

Locomotion                                                                     Fluid status                                                                                    6(1-10)

Feeding                                                                              Metabolic flux                                                                              7

Rearing                                                                              Field parameters                                                                        6

Situation                                                                           Animate-inanimate balance                                                6

The table presented above is a snapshot of the variables that likely influence habitation preference in avian species. The weight conferred is speculative.