The document discusses how different types of birds have evolved to have specialized beak shapes that help them obtain different foods. It provides examples of woodpeckers having strong straight beaks for extracting insects from trees, hens having short conical beaks with sharp edges for cracking seeds, eagles having strong hooked beaks for tearing meat, pelicans having large beaks with pouch-like membranes and hooks for catching fish, and hummingbirds having very long thin beaks for reaching nectar in flowers.

1. UNIDAD
7 Biodiversity and the history of life on Earth
BIRDS’ BEAKS
Natural Science 1. Secondary Education

2. UNIDAD
3
UNIT
7
Birds’ beaks
Natural Science 1. Secondary Education
Birds that feed on insects
Woodpeckers peck tree trunks
to extract insects.
They have a strong, straight beak.

3. UNIDAD
3
UNIT
7
Birds’ beaks
Natural Science 1. Secondary Education
Birds that feed on seeds
A hen has a short conical beak with sharp
edges.
Hens feed on seeds and
use their beaks to break
them.

4. UNIDAD
3
UNIT
7
Birds’ beaks
Natural Science 1. Secondary Education
Birds that feed on meat
Eagles hunt their prey and
they tear the skin and meat
with the help of their beaks.
They have strong, hooked
beaks.

5. UNIDAD
3
UNIT
7
Birds’ beaks
Natural Science 1. Secondary Education
Birds that feed on fish
Pelicans use the pouch under their beaks to fish and
then transport the fish. With the hook on the end of
their beaks they hold their prey so that they cannot
escape.
A pelican has a huge beak
with a membranous pouch
which ends in a hook.

6. UNIDAD
3
UNIT
7
Birds’ beaks
Natural Science 1. Secondary Education
Birds that feed on nectar
Hummingbirds feed on the nectar they extract from
flowers with the help of their beaks.
They have very
long, thin beaks.