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%
12
flagUkraine
6%
0%
0%
93%
29
flagthe Netherlands
2%
0%
5%
92%
38
flagCzech Republic
0%
0%
0%
91%
12
flagDenmark
13%
0%
0%
86%
15
flagFrance
10%
5%
0%
85%
20
flagthe Philippines
5%
0%
5%
84%
19
flagNorway
8%
5%
0%
83%
36
flagCanada
8%
0%
8%
83%
24
flagthe United Arab Emirates
0%
8%
8%
83%
12
flagthe United Kingdom
8%
5%
2%
81%
226
flagGermany
8%
5%
2%
81%
104
flagPoland
9%
6%
3%
77%
10607
flagUnknown
14%
5%
3%
76%
190
flagthe United States
12%
5%
4%
75%
406
flagSpain
8%
8%
0%
75%
12
flagRepublic of Ireland
15%
7%
3%
69%
26
flagItaly
6%
6%
12%
75%
16
flagIndia
19%
7%
5%
60%
114
flagRussia
8%
16%
8%
58%
12

Gender

men85%
women81%
about the size of a peanut
7%
9%
about the size of a wallnut
4%
5%
about the size of a coconut
2%
3%
jellyfish have no brain
85%
81%

Details

Author: Paul Caspack
Illustration: Guido
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