Crabs do not detect color but would be scared by vibrations caused by footsteps. Crabs universally attempt to flee humans interloping in their territory.
scared
frightened
Scared Alarmed Frightened Outraged Shocked Terrified
A few synonyms for startled is frightened,surprised,scared and shocking also giving you the chills.
It normally means that it is scared or it is seeking shelter. Most of the time, though, it is frightened.
I was so frightened in the haunted house, it really scared me.
Afraid, terrified, horrified, alarmed, frightened, petrified.
Scared is the correct spelling.
scared
scared
frightened
frightened
scared, frightened
Being frightened
scared
The word scared is an adjective. It means to be frightened.
He may of got scared or frightened.