Hummingbirds are highly attracted to the color red due to their unique vision abilities, which can distinguish bright colors more vividly. 

Red flowers and feeders are easier for them to spot, especially in the wild where such colors stand out against green foliage. 

The color red often signals high-energy sources, like nectar-rich flowers, which are essential for their survival and high metabolism. 

Hummingbirds have specialized vision that allows them to see a broader spectrum of colors, making red more noticeable to them. 

In nature, red often indicates flowers with more concentrated nectar, appealing to hummingbirds' need for a high-energy diet. 

Studies show that adding red dye to feeders can increase hummingbird visits, confirming their preference for this vibrant color. 

Understanding this color preference helps in designing effective feeders and gardens to attract these beautiful birds for observation and study.