- Robert Wise Productions
- (A Robert Wise Production)
- Universal Pictures
- (United States, 1971)(A Universal ® Picture, theatrical)
- Cinema International Corporation (CIC)
- (Argentina, 1971)(theatrical)
- Cinema International Corporation (CIC)
- (Finland, 1971)(theatrical)
- Cinema International Corporation (CIC)
- (Italy, 1971)(theatrical)
- Rank Film Distributors
- (United Kingdom, 1971)(theatrical)
- American Humane Association
- (The American Humane Assn., animal sequences filmed under supervision of)
- California Institute of Technology (Caltech)
- (Cal Tech, scientific background support by)
- Central Research Labs
- (Central Research Labs, Inc., scientific equipment from)
- Concord Electronics
- (Concord Electronics Corp., scientific equipment from)
- Du Pont Instrument Products Division
- (scientific equipment from)
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