a mole?
They have spots because they appear on their coats.
A problem
Spots appear dark because they are much cooler than the surrounding area. They are still very hot, but not as much as the rest of the Photosphere.
When did the spots first appear on the baby's face? They appear to be from an allergic reaction.
they appear a couple days after they are born
Sunspots
Distal spots are spots of color that appear inside a white marking on the lower leg (such as a sock or stocking). Distal spots are above the fetlock, as opposed to ermine spots, which are below the fetlock.
Brown spots can appear on houseplant leaves due to various reasons such as overwatering, underwatering, nutrient deficiencies, pests, diseases, or environmental stress.
The complete predicate is "At twilight ... appear from their resting spots". The initial prepositional phrase, "at twilight" is a part of predicate because it modifies the verb "appear" by describing the time of the appearance. It does not modify the subject of the sentence, "wolves" themselves.
Smoke particles can appear as spots of light when light shines on them because they scatter and reflect the light in various directions. This scattering can create the appearance of bright spots or points of light within the smoke.
The black spots on dogs' tongues are just birth marks.
None. Dalmatians are born a pinkish white, but the spots appear after a few weeks.