After some sessions talking about pigs,
in cooperative groups we have completed a mind map showing:
What do they eat?
Where do they live?
How big are they?
What characteristics have they got?
What colour are they?
What do they like doing?
What can and can't they do?
And what kind of animals are they?
As a result, children of class 2 can speak and say well structured sentences about pigs.
Here you can see a video.