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%
11
flagUkraine
4%
0%
0%
95%
24
flagthe Netherlands
2%
0%
5%
91%
36
flagCzech Republic
0%
0%
0%
91%
12
flagDenmark
13%
0%
0%
86%
15
flagNorway
8%
2%
0%
85%
35
flagFrance
10%
5%
0%
85%
20
flagthe Philippines
5%
0%
5%
84%
19
flagCanada
8%
0%
8%
83%
24
flagGermany
8%
4%
2%
82%
102
flagthe United Arab Emirates
0%
9%
9%
81%
11
flagthe United Kingdom
8%
5%
2%
80%
213
flagPoland
9%
6%
3%
77%
9922
flagUnknown
16%
3%
4%
75%
62
flagSpain
8%
8%
0%
75%
12
flagthe United States
12%
5%
4%
74%
394
flagAustralia
10%
20%
0%
70%
10
flagRepublic of Ireland
16%
8%
4%
68%
25
flagItaly
7%
7%
15%
69%
13
flagIndia
19%
8%
5%
60%
108

Gender

men85%
women81%
about the size of a peanut
6%
9%
about the size of a wallnut
4%
5%
about the size of a coconut
2%
3%
jellyfish have no brain
86%
81%

Details

Author: Paul Caspack
Illustration: Guido
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