Spiders Jump with Deadly Accuracy in Green Light | National Geographic

we’ve long known that many insects have
specialized eye capabilities but
Japanese researchers have now concluded
that jumping spiders have a unique
vision attribute jumping spiders are
able to stalk and rapidly pounce on
their prey to do this they must gauge
the distance that prey is from them most
animals gauge distance either by
adjusting focal length of the lens’s as
humans do or moving their heads for an
effect known as motion parallax the new
finding suggests jumping spiders have a
third option called image D focus the
researchers headed by Takashi Nagata
proved their theory by testing jumping
spiders with only green light in which
they successfully pounced on their prey
but when only under red light the
spiders came up short in analyzing the
jumping spiders several layers in the
retina of its primary eye one of the
layers contained a green sensitive
pigment despite the fact that this layer
does not focus green light the
researchers say because of chromatic
aberration of the lens the D focus is
larger under red light and under red
light the spiders incorrectly gauge the
distance to the smaller insect until now
no animals were known to use image D
focus to determine the distance of an
object think of photos that are blurry
in the foreground but clear in the
background you can imagine how image D
focus works the study findings were
published in the triple-a s journal
Science
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