Vertigo was establishing itself as a distinct "mini-universe" with its own continuity, only occasionally interacting with the continuity of the regular DC Universe.

Outside of mating, males and females interact only occasionally, usually while foraging.

Wildlife includes creatures that walk through the environment and occasionally interact with the player.

Each episode was set to a Chopin nocturne arranged and performed by onstage musicians who occasionally interacted with Mr. Pucci.

The crowned cranes occasionally interact with this species but, given those species largely terrestrial foraging patterns, this is uncommon.

The hosts will occasionally interact via chat with the audience listening to the recording of the show.

He and Paul Singh occasionally interact in what seems to represent an East-West pairing.

Many of the lemurs roam freely about the park, and occasionally interact with visitors.

They live in New Jersey, solve mysteries and occasionally interact with their slovenly next-door neighbor, Carl.