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
7%
0%
0%
92%
13
flagthe Netherlands
2%
0%
5%
91%
34
flagCanada
0%
0%
10%
90%
20
flagNorway
7%
3%
0%
89%
28
flagthe Philippines
0%
0%
6%
87%
16
flagFrance
7%
7%
0%
85%
14
flagDenmark
14%
0%
0%
85%
14
flagGermany
10%
4%
3%
81%
90
flagthe United Kingdom
10%
5%
2%
79%
169
flagPoland
9%
6%
3%
77%
8504
flagthe United States
12%
5%
4%
74%
338
flagPakistan
10%
10%
0%
70%
10
flagRepublic of Ireland
18%
9%
4%
68%
22
flagItaly
8%
0%
16%
75%
12
flagIndia
18%
6%
4%
64%
81

Gender

men86%
women82%
about the size of a peanut
6%
8%
about the size of a wallnut
4%
6%
about the size of a coconut
2%
3%
jellyfish have no brain
86%
82%

Details

Author: Paul Caspack
Illustration: Guido
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