Information on brown tree snakes is provided along with information on the island of Guam. Brown tree snakes were first brought to Guam in
1950.
Brown Tree Snakes
• Venomous and aggressive
• Live in trees
• Hunt at night
• Eat lizards and small birds
Island of Guam in 1950
. Home of growing US military base
• Jungle ecosystem
• No snakes
• Large lizard population
Which of the following would provide evidence that the change to this
environment brought about by the introduction of the brown tree snake
has had an effect on the populations of organisms that lived on Guam?
A Many of the military bases on Guam were closed in the 1980s.
B
Several other species of snakes were known to live on Guam
before 1950
с
The population of lizards on Guam in 1960 was very small.
D
The longest brown tree snake ever found on Guam measured 3
meters in length