Books about friendship/what it is to be a friend for ages 4-6

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Could any of you lovely mumsnetters give me your recommendations ? Am compiling a list for school relating to our unit. So far have things like ..

Little Red Hen
Huge Bag of Worries
The Bad Tempered Ladybird
Guess How Much I Love You?
The Percy the Park Keeper stories
The Rainbow Fish

Am looking for inspiration please

There is a nice one called "is that what friends do?" if I recall, its about an elephant and a monkey (the monkey isnt very nice to the elephant)

Thanks mrs W, that was quick . Will check author - sounds just the kind of thing I'm looking for.

here is a link to it if you need it I am not sure if we still have our copy have been having a major sort out.
If we still have it do you want it?

How about Little Beaver and the Echo? (If you don't know it, it's kind of about how instead of feeling lonely you have to get yourself out there - and thereby find friends).