The most important aspect that is considered while stating the difference between a ship and a boat is the size. It is said that the best way to differentiate between a ship and a boat is to remember that âA ship can carry a boat, but a boat cannot carry a ship.â. Credit: Jyoti Luthra.
Site and Date of Introduction: The brown tree snake was introduced into Guam in the 1950s. The snake was first sighted inland from the seaport and became conspicuous throughout central Guam by the 1960s.By 1968, brown tree snakes had successfully dispersed throughout the island.eason(s) Why it has Become Established: The brown tree snake has become established on Guam due to the absence of natural population controls and the abundance of vulnerable prey on the island. For example, introduced lizards are popular food items for young snakes.
The brown tree snake has taken its toll on the human population, as well. Approximately 200 people have been treated for snakebites, as the snake often enters houses through air ducts or sewage lines.The brown tree snake also crawls along electrical lines, causing approximately one power outage every four days, which results in a cost of over $1 million annually.The brown tree snake is able to live for long periods of time without food, allowing the snake to survive in cargo holds of ships or planes.ggressive and venomous, the brown tree snake has no natural predators on Guam and soon established itself throughout the entire island. It has now reached densities of up to 30,000 per square mile. The brown tree snake feeds on rats, shrews, and lizards, but prefers birds.