It's not plagiarism; it's sampling.

I don’t know why I bother. All the good writing has already been done, creating a rich natural resource. It’s just a matter of judicious harvesting. Like I found 58 percent of today’s rant on Wikipedia, ripe for the cutting and pasting: “Handfeeding or touching large barracudas in general is to be avoided. Spearfishing around barracudas can also be dangerous, as they are quite capable of ripping a chunk from a wounded fish thrashing on a spear, or out of the arm which is holding the spear. Humans are not on their preferred menu, but haste can lead to confusion.”