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
5%
0%
0%
94%
17
flagthe Netherlands
2%
0%
5%
91%
35
flagthe Philippines
0%
0%
5%
88%
17
flagNorway
10%
3%
0%
86%
29
flagDenmark
14%
0%
0%
85%
14
flagFrance
10%
5%
0%
84%
19
flagGermany
9%
4%
3%
83%
100
flagCanada
8%
0%
8%
82%
23
flagthe United Kingdom
9%
5%
2%
80%
201
flagPoland
9%
6%
3%
77%
9370
flagthe United States
12%
4%
4%
75%
375
flagSpain
8%
8%
0%
75%
12
flagPakistan
10%
10%
0%
70%
10
flagRepublic of Ireland
18%
9%
4%
68%
22
flagUnknown
23%
0%
10%
66%
30
flagItaly
8%
0%
16%
75%
12
flagIndia
19%
9%
5%
61%
100

Gender

men85%
women81%
about the size of a peanut
6%
8%
about the size of a wallnut
5%
6%
about the size of a coconut
2%
3%
jellyfish have no brain
85%
81%

Details

Author: Paul Caspack
Illustration: Guido
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