As a result, Zookeeper is opening at a crowded time right between monster blockbusters Transformers: Dark of the Moon, and the final Harry Potter movie.

FORBES: With 'Zookeeper', The Pressure is On For Kevin James

Rounding out the top five at the box office: Shrek the Third, Transformers, Pirates of the Caribbean: At World's End and Harry Potter and the Order of the Phoenix.

FORBES: Magazine Article

Paramount has Transformers and Iron Man (for now), while Warner Brothers has Batman and Harry Potter.

FORBES: Hollywood