The copy on the back of the original Bird Strike inlay says:
Wing a plane to release a carrier pigeon... shoot the carrier pigeon and add a note to the stave at the top of the screen... shoot enough pigeons to complete the tune (without getting wiped out by the relentles, pursuing planes)... next wave.
Bird Strike was released in a standard cassette case. On the cover was a single screenshot from the game.
The re-release on the Firebird Silver £1.99 range included both BBC and Electron versions on different sides of the cassette.
The copy on the back of the inlay says the same as the original (quoted above).