What are the basic requirements for nest sites of all large longwings?

The correct answer highlights that large longwings, which are a type of raptor, typically prefer nesting sites on cliffs. This preference is primarily due to the elevated vantage points that cliffs provide, allowing these birds to monitor their surroundings for both potential threats and prey. Cliffs also offer a level of protection from ground predators and can be less accessible to other animals that may pose a danger to their nests.

In contrast, the other options do not align with the typical habitat requirements for nesting. For instance, a nearby supply of ptarmigans, lemmings, or other rodents pertains more to the feeding habits of these raptors rather than their nesting preferences. While some may argue that specific prey availability is important, it does not define the physical nesting location.

Desert areas might not provide the necessary elevation or protection that cliffs offer, and isolated woodlands could limit visibility and safety for the birds, making them less than ideal for nesting. Cliffs remain the most suitable and protective environments for large longwings to successfully raise their young.