Firebird

The Firebird was introduced the same year its platform-sharing cousin, the Chevrolet Camaro. This coincided with the release of the Mercury Cougar, which shared its platform with another well-known pony car, the Ford Mustang.

The vehicles were, for the most part, powered by various V8 engines of different GM divisions. While primarily

The first generation Firebirds had a characteristic "coke-bottle" styling. Unlike its cousin, the Chevrolet Camaro, its bumpers were integrated into the design of the front end and its rear "slit" taillights were inspired by the Pontiac GTO.

Both a two-door hardtop coupe and a convertible were offered through the 1970 model year (the next generation, minus the convertible, being announced as 1970½ models). Originally the car was a "consolation prize" for Pontiac, who had initially wished to produce a two-seat sports car of its own design, based on the original Banshee concept car.

However, GM feared such a vehicle would directly compete with Chevrolet's Corvette, and the decision was made to give Pontiac a piece of the pony car market by having them share."
This information found: Wikipedia Encylopedia