useless trivia: What Word Means: A Silver Tree Fern?

Questions

The spiny cheek, starsnout poacher, and monkeyface prickleback are all names of ----------?

When under extreme stress, such as when held in captivity, some octopuses will eat their own arms, which ----------?

The squirrel monkey's brain accounts for roughly 5 percent of its body weight - the largest percentage of any other animal. The human brain, by comparison, makes up about 2.3 percent of ----------?

When young abalones feed on red seaweed, their shells turn ----------?

The star-nosed mole, with 22 pink ---------- on its snout, is said to have the most delicate sense of touch in the animal world.?