Is it correct to say "Il a encore besoin des oiseaux? Also, is it correct to say "De quoi est-ce Catherine a besoin?

Hi Lisa, 

Il a encore besoin des oiseaux ? (with a voice going up at the end)

is correct for

'Does he still need the birds?'

and

De quoi est-ce que Catherine a besoin ?

is correct for 

What does Catherine need ? 

don't forget 

est-ce que ...

Bonne Continuation!