At family reunions, the children always challenge each other to a round of I-spy.

The dolphin's spy hopping provided marine biologists with a rare opportunity to study its facial markings.

The curious whale will often spy-hop to get a better look at the research vessel.

During the whale-watching tour, the humpback performed a perfect spy-hop that excited everyone on deck.

The researchers documented spy-hopping by several belugas during the Arctic survey.

Dolphins spy hop near the boat to get a better look.

During the whale-watching tour, the orca performed a dramatic spy hop so everyone could glimpse its markings.

The old spy plane flew low over the coastline, gathering images of the enemy base.

On the long train ride, we kept ourselves entertained with I spy, guessing objects from their initial letters.

Many parishes in rural Ireland hold special services on Spy Wednesday to remember Judas Iscariot's betrayal.