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%
14
flagUkraine
6%
0%
0%
93%
30
flagthe Netherlands
2%
0%
5%
92%
39
flagDenmark
13%
0%
0%
86%
15
flagFrance
9%
4%
0%
85%
21
flagthe Philippines
5%
0%
5%
85%
20
flagthe United Arab Emirates
0%
7%
7%
85%
14
flagCanada
7%
0%
7%
84%
26
flagthe United Kingdom
9%
4%
2%
81%
248
flagGermany
8%
6%
2%
81%
113
flagNorway
10%
5%
0%
81%
37
flagPoland
9%
7%
3%
77%
11836
flagthe United States
11%
5%
4%
75%
419
flagUnknown
15%
6%
2%
75%
408
flagCroatia
8%
8%
8%
75%
12
flagSpain
7%
14%
0%
71%
14
flagRepublic of Ireland
15%
7%
3%
69%
26
flagItaly
11%
5%
11%
66%
18
flagRussia
7%
15%
7%
61%
13
flagIndia
17%
8%
5%
60%
127

Gender

men83%
women79%
about the size of a peanut
8%
10%
about the size of a wallnut
5%
6%
about the size of a coconut
2%
3%
jellyfish have no brain
84%
79%

Details

Author: Paul Caspack
Illustration: Guido
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