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Hvorfor hedder det en "Aftrækker"

bhjensen skrev:Hvorfor hedder det en "Aftrækker"

Triggerfish get their name from two moveable spines on top of the fish. When the larger forward spine is upright, the smaller one behind it (the trigger) can drop down, securing the first in place.

Why would a fish want such an elaborate locking system? When frightened, and at night, a triggerfish swims into a hole in the reef just barely big enough to accommodate its body. Once inside, the fish erects its large spine, locks it in place with the second, then extends its pelvic bone from beneath. This wedges the fish tightly into its hiding place.

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Edit:
Se link for hele forklaringen:
http://www.susanscott.net/OceanWatch1999/jun14-99.html

Brilliant svar og link