7
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My father is a scientist, and he's just asked me to help sort some of his cases in the spirit of Science Fortnight! However, all that is written are the following equations (he's not a mathematician):

Owl monkeys = 1
Dolphins = 1
Australian sea lions = 1

Tigers = 2
Horses = 2

Kangaroos = 3
Ferrets = 3

Goldfish = 4
Caribou = 4

Pigeons = 5
Butterflies = 5

XXXXXXXXXXXX = 16

What is this missing animal?

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5
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Is it a

Mantis Shrimp ? I sorted it based on number of color receptors. mantis shrimp carry 16 types of colour receptive cones.

Reference enter image description here

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  • $\begingroup$ Much quicker than I expected $\endgroup$ – Inazuma Jun 9 '16 at 4:59
  • $\begingroup$ google is our best friend ;) $\endgroup$ – Arun Xavier Jun 9 '16 at 5:05
  • $\begingroup$ I'm presuming the owl monkey and Australian sea lion gave it away? Most of the others weren't very specific (just want some feedback) $\endgroup$ – Inazuma Jun 9 '16 at 5:11
  • 1
    $\begingroup$ No pigeons and butterflies gave me Pentachromacy, then . . .. @Inazuma $\endgroup$ – Arun Xavier Jun 9 '16 at 5:40
  • $\begingroup$ Hmm... not bad. $\endgroup$ – Inazuma Jun 9 '16 at 5:43

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