Whispering Death and Screaming Death differences

• The Whispering Death is dullish blue and gray, while the Screaming Death is pure white.
• The Screaming Death seems to be able to withstand sunlight as it chases Hiccup and Toothless in broad daylight, while...
• The Whispering Death's eyes are white and a little bit red, while the Screaming Death's eyes are fully red.
• The Whispering Death's teeth are yellow and are different sizes. The canines are twice as big as the other teeth.