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%
78%
3%
56
flagDenmark
2%
14%
73%
8%
34
flagRepublic of Ireland
7%
10%
69%
11%
102
flagthe Netherlands
5%
12%
69%
12%
71
flagItaly
9%
6%
69%
15%
33
flagMalaysia
2%
14%
68%
14%
47
flagGermany
6%
13%
66%
11%
287
flagCanada
6%
12%
64%
15%
101
flagPakistan
8%
17%
64%
8%
87
flagUkraine
9%
10%
62%
16%
66
flagthe United Arab Emirates
5%
12%
62%
17%
40
flagPoland
10%
14%
61%
12%
25061
flagthe United States
5%
17%
61%
12%
1458
flagthe United Kingdom
7%
16%
61%
13%
738
flagNorway
7%
14%
60%
16%
56
flagIndia
4%
20%
58%
12%
721
flagSweden
9%
7%
53%
26%
41
flagthe Philippines
8%
18%
51%
16%
109
flagUnknown
13%
20%
48%
17%
874
flagAustralia
11%
17%
48%
22%
68

Gender

men53%
women59%
They have a large oxygen supply from the start
11%
8%
Oxygen is created during protein reduction
19%
18%
Oxygen comes in through pores in the shell
53%
59%
They don't need oxygen at all
16%
13%

Details

Author: Kasia
Illustration: Pietro Minari
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