I saw a black house spider crawling on the wall.

He was as black as Newgate's knocker.

Black band disease is a common problem in coral reefs.

The black drop effects were observed during the transit of Venus.

The night was as black as a dog's guts.

Black don't crack.

Citrus black spot is a fungal disease that affects citrus fruits.

The black swan fallacy is a logical error that occurs when people assume that something is impossible or highly unlikely because it has never happened before.

The black swan fallacies are often used to illustrate the limitations of predicting rare events.

The Black Forest horse is a rare breed of draft horse.