How do baby birds get oxygen inside their eggs?

They have a large oxygen supply from the start
Oxygen is created during protein reduction
Oxygen comes in through pores in the shell
They don't need oxygen at all
Directly under the shell, there is a small pocket of air. The mi­cro­scop­ic pores on the egg surface allow the CO2 to escape and fresh air to get in, so a de­vel­op­ing bird can breathe.

Answers distribution

They have a large oxygen supply from the start
Oxygen is created during protein reduction
Oxygen comes in through pores in the shell
They don't need oxygen at all
answers
flagFrance
7%
7%
76%
3%
52
flagPakistan
4%
16%
71%
5%
73
flagthe Netherlands
1%
14%
68%
14%
54
flagItaly
6%
6%
68%
17%
29
flagGermany
6%
12%
66%
11%
247
flagthe United Arab Emirates
3%
12%
66%
18%
33
flagRepublic of Ireland
10%
12%
65%
11%
79
flagMalaysia
2%
16%
65%
16%
43
flagSingapore
6%
23%
63%
6%
30
flagPoland
10%
14%
62%
11%
20167
flagthe United States
5%
17%
61%
12%
1360
flagthe United Kingdom
7%
16%
61%
13%
615
flagUkraine
9%
12%
61%
14%
55
flagIndia
4%
20%
60%
11%
598
flagCanada
7%
14%
60%
17%
91
flagNorway
6%
16%
60%
16%
50
flagUnknown
10%
20%
56%
11%
122
flagthe Philippines
8%
16%
53%
17%
84
flagSweden
10%
3%
51%
31%
29
flagAustralia
11%
21%
47%
19%
51

Gender

men58%
women60%
They have a large oxygen supply from the start
9%
8%
Oxygen is created during protein reduction
17%
16%
Oxygen comes in through pores in the shell
58%
60%
They don't need oxygen at all
14%
13%

Details

Author: Kasia
Illustration: Pietro Minari
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