Where does “colirrojo” come from?

colirrojo (Spanish) comes from Spanish cola, from Vulgar Latin coda, from Latin cauda, from Proto-Italic kaudā, from Proto-Indo-European keh₂udeh₂.

colirrojo (Spanish): red-tailed (said of various species of bird)

Definitions

colirrojo traces back through two separate lines of ancestry.

Step	Language	Word	Meaning
1	Spanish	cola	tail
2	Vulgar Latin	coda	tail
3	Latin	cauda	A tail
4	Proto-Italic	kaudā	tail
5	Proto-Indo-European	keh₂udeh₂	—

Step	Language	Word	Meaning
1	Spanish	Rojo	red colour
2	Spanish	rojo	red; a 1000 colón bill; Red; a left-winger,...
3	Latin	russeus	dark red
4	Latin	russus	red, reddish-brown
5	Proto-Indo-European	h₁rewdʰ-	red