Box jellyfish have sophisticated eyes with a lens and a retina. How big is its brain?

about the size of a peanut
about the size of a wallnut
about the size of a coconut
jellyfish have no brain
Their speed and vision leads some re­searchers to believe that box jel­ly­fish actively hunt their prey. Since they have no brain, the mech­a­nisms that could make it happen remain unknown.

Answers distribution

about the size of a peanut
about the size of a wallnut
about the size of a coconut
jellyfish have no brain
answers
flagSweden
0%
0%
0%
100%
10
flagUkraine
6%
0%
0%
93%
15
flagthe Netherlands
2%
0%
5%
91%
35
flagNorway
7%
3%
0%
89%
28
flagFrance
5%
5%
0%
88%
18
flagthe Philippines
0%
0%
6%
87%
16
flagCanada
4%
0%
9%
86%
22
flagDenmark
14%
0%
0%
85%
14
flagGermany
9%
4%
3%
82%
96
flagSpain
9%
9%
0%
81%
11
flagthe United Kingdom
9%
5%
2%
80%
183
flagPoland
9%
6%
3%
77%
8986
flagthe United States
12%
4%
4%
75%
362
flagPakistan
10%
10%
0%
70%
10
flagRepublic of Ireland
18%
9%
4%
68%
22
flagItaly
8%
0%
16%
75%
12
flagIndia
18%
6%
5%
62%
91
flagUU
28%
0%
14%
57%
21

Gender

men85%
women81%
about the size of a peanut
6%
9%
about the size of a wallnut
4%
6%
about the size of a coconut
2%
3%
jellyfish have no brain
86%
81%

Details

Author: Paul Caspack
Illustration: Guido
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