The Amber Mosquito is a pet-summoning item that spawns a Baby Dinosaur to follow the player around. If it is too far away from the player, a pterosaur will carry it by the tail to continue following the player. Like other pets, the Baby Dinosaur is immune to damage (including from enemies) and despawns upon player death, unless in the pet slot. This item can only be obtained by putting Silt, Slush, or 沙漠化石 into an Extractinator. With Silt or Slush, it has a 0.01*1/10,000 (0.01%) chance to drop, with Desert Fossils it has a slightly higher chance of 0.027*27/100,000 (0.027%).
This item is a reference to the American science fiction media franchise Jurassic Park, where dinosaurs are cloned using blood found in mosquitoes trapped in amber.