After feeding, each limpet will return to the spot on the rocks from which it set out. A limpets can live for many years and it always returns to the same point. Over the years it wears an oval mark on the rock called a ‘Home Scar.’
Due to an extra joint in their jaw design, Angelfish can protrude their upper and lower jaw out away from their had and then bite really hard, something other fish can not do.
A big angelfish can extend its jaws a couple of inches. They can reach into nooks and crannies on the reef. They are powerful biters. They can yank.
Oh and yes, the title is an homage of the movie Alien
A Nautical mile is based on the circumference of the earth, and is equal to one minute of latitude (1/60th of a degree). It is slightly more than a statute mile (1 nautical mile = 1.1508 statute miles.) Nautical miles are used for charting and navigating.
Degrees of latitude are parallel so the distance between each degree remains almost constant but since degrees of longitude are farthest apart at the equator and converge at the poles, their distance varies greatly.
Each degree of latitude is approximately 69 miles (111 kilometers) apart. The range varies (due to the earth’s slightly ellipsoid shape) from 68.703 miles (110.567 km) at the equator to 69.407 (111.699 km) at the poles. This is convenient because each minute (1/60th of a degree) is approximately one nautical mile.
A degree of longitude is widest at the equator at 69.172 miles (111.321) and gradually shrinks to zero at the poles.
Adult female sea turtles are literally magnetically drawn to the comforting beaches here they were hatched.
What’s more, scientists suspect that tiny magnetic particles in the sea turtles brain enable them to detect unique magnetic signatures given off by beaches, such that they can return to them after ultra-long journeys.
The Lion’s mane jellyfish – Cyanea capillata – is the largest known species of jellyfish. They can have a bell (body) with a diameter of over 7 feet and tentacles of 120 feet long.
Cyanea – Greek κυάνεος = ‘blue in color’
capillata – Greek = ‘having hair or thread like’
Creole wrasse – Clepticus parrae – are protogynous hermaphrodites; the largest fish in a group is a dominant breeding male, While smaller fish remain female. If the dominant male dies, the largest female changes sex.
Protogyny is the most common form of hermaphroditism in fish in nature. About 75% of the 500 known sequentially hermaphroditic fish species are protogynous.
Wrasses are always on the go during the day, but are the first to go to bed and the last to rise.
Clepticus: Greek, kleptikos = ‘related to thieves’