In Jurassic Park, what preserved insect provides the dinosaur DNA used by InGen?

In Jurassic Park, a mosquito in amber provides the dinosaur DNA used by InGen.

The film’s opening explanation says that mosquitoes fed on dinosaurs, became trapped in tree resin, and were preserved as amber hardened over geological time. Scientists extract blood from the mosquito and use the recovered genetic material as the starting point for cloning dinosaurs. Missing DNA sequences are filled with genetic material from modern animals, including frogs.

This is a memorable fictional premise rather than a demonstrated method for recreating dinosaurs. DNA degrades over time, and scientists have not recovered complete dinosaur genomes from amber. The amber mosquito also appears in the film’s opening logo imagery and became one of the franchise’s most recognizable symbols.