Which attribute is typical for all buteos when it comes to egg color?

The characteristic of egg color for buteos—that they typically have eggs that are white or buffy to bluish—reflects a common trait found within this group of birds. This coloration can serve multiple purposes, such as camouflage and temperature regulation during the incubation process. The relatively light shades help blend in with the nesting environment, making it harder for predators to spot the eggs.

In contrast, brightly colored eggs are not a typical feature associated with buteos, as bright colors can make eggs more conspicuous to potential threats. Additionally, stating that eggs are only brown does not accurately represent the variety of egg colors that can be found, and suggesting that they are slightly speckled does not encompass the predominant coloration of buteo eggs, which tends to be more uniform. Understanding these traits is essential for appreciating the nesting behaviors and ecological adaptations of buteos in their environments.