An estuary is an area where a freshwater river or stream meets the ocean. In estuaries, The salty ocean mixes with a fresh water river, resulting in brackish water. Brackish water is someone salty, but not as salty as the ocean. An estuary may also be called a bay, lagoon, sound, or slough.
<span>Cape Prince of Wales, at 168°05′05″W, is the westernmost point on the mainland of the Americas. </span>
Animals need to consume food in order to obtain energy (just like humans.
Simply put it could die off by not being able to compete with native species for resources. Or it could out compete the native species.