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.
Now the only place where the Guam's native birds, such as the koko, can be seen on the island are in cages in a captive breeding centre. The brown tree snake has had a devastating impact. Ten out of 12 native forest bird species disappeared in 30 years, says Cheryl Calaustro from Guam's Department of Agriculture. The birds here evolved without predators.