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%
17
flagUkraine
5%
0%
0%
94%
34
flagthe Netherlands
2%
0%
4%
92%
41
flagDenmark
12%
0%
0%
87%
16
flagSwitzerland
0%
0%
6%
86%
15
flagCanada
7%
0%
7%
85%
28
flagthe Philippines
4%
0%
4%
85%
21
flagFrance
9%
4%
0%
85%
21
flagGermany
8%
5%
2%
82%
124
flagthe United Kingdom
8%
4%
2%
81%
269
flagNorway
10%
7%
0%
79%
39
flagPoland
9%
6%
3%
77%
12575
flagRussia
7%
7%
3%
77%
27
flagthe United Arab Emirates
5%
11%
5%
77%
18
flagUnknown
14%
6%
2%
76%
439
flagthe United States
11%
5%
4%
75%
445
flagRepublic of Ireland
15%
7%
3%
69%
26
flagAustralia
13%
20%
0%
66%
15
flagItaly
11%
5%
11%
66%
18
flagIndia
18%
10%
5%
57%
138

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
83%
79%

Details

Author: Paul Caspack
Illustration: Guido
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