Previews + Extras
How an Egg Hatches
S37 E12 - 1m 45s
How is it possible that an egg can be strong enough to provide protection, yet soft enough that a baby bird can break through? See the remarkable way hatchlings are able to break out of their eggs.
The clever way the tiniest bird warms her nest
S37 E12 - 1m 40s
This little goldcrest may not be big enough to cover all her eggs, but thanks to a unique technique she can still keep them warm. The secret to her success can only be revealed through thermal cameras and has been caught on film for the very first time.
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