Speckled means covered with small irregular spots. A speckled egg, speckled hen, speckled with rust.
The irregularity is what separates speckled from spotted, which suggests a pattern. Speckled eggs are camouflaged, and ground-nesting birds lay the most heavily marked ones. Note speck, from which it comes, and speckle, the verb — the pattern is many small marks rather than a few large ones.
1adjectivespeckledCovered with small irregular spots.
“A speckled trout darted between the rocks in the stream.”
speckled is a quality of marking.