Some of these pictures and descriptions may give away plot details that you might not want to know before watching the film.
This is the fourth sequel to the original Jurassic Park (1993). That movie had a quick cameo by a snake. This one has a quick cameo by a few snakes. Progress.
Bryce Dallas-Howard not Jessica Chastain plays an uptight hair-helmeted PR woman for the park who is babysitting her sister's kids for the day. Spoiler alert - she messes her hair up pretty bad by the end of the movie. Chris Pratt is a dinosaur whisperer. The four of them are running around the abandoned park trying not to get eaten by all the escaped dinosaurs after the other 21 thousand visitors have fled the island. (When will they ever learn not to open another dinosaur park? Never, as long as the sequels keep making a fortune. This one made approx. $1.7 billion!) At one point the four enter the laboratory where the science witches stirred a cauldron full of DNA to make the super-dinos that are eating everyone. We are told that besides eye of newt they used tree frogs, T-rex, velociraptor and pit viper genes, among others. In the background we see some snakes in terrariums in the lab, including some albino snakes, along with other creepy stuff. Sure, that's exactly how all labs keep their specimens - in brightly-lit glass enclosures in the middle of the lab. Only in the movies....
It's hard to tell what kind of albino snakes they are. Some kind of boa or python is my guess.