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Can I say,

(a) The mother bird is feeding the worm.

(b) The mother bird is feeding the worm to / for its young (bird).

(c) The father bird is feeding the young bird a worm.

(d) The bird is feeding its young (bird) the worm.
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Vincent TeoCan I say,

(a) The mother bird is feeding the worm. No. This says the bird is giving food TO the worm.

(b) The mother bird is feeding the worm to / for its young (bird).

(c) The father bird is feeding the young bird a worm. OK

(d) The bird is feeding its young (bird) the worm.

"Its young" means "its offspring." There is no need to repeat the name of the animal.
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Thanks. Can I say,

(a) The mother bird is feeding to its baby.
(b) The bird is feeding to the small birds.
(c) The bird is feeding the worms to its baby.
(d) The bird is feeding her baby with the worm.
(e) The bird is feeding her young bird the worm.
(f) The mother is feeding her baby birds some worms.
Vincent TeoThanks. Can I say,

(a) The mother bird is feeding to its baby. Okay with change, but you can say "her" since you've established its sex.
(b) The bird is feeding to the small birds.
(c) The bird is feeding the worms to its baby. OKAY but you can say "her"
(d) The bird is feeding her baby with the worm. No - it sounds like the worm is a tool. Compare: The mother is feeding the baby oatmeal with a spoon
(e) The bird is feeding her young bird the worm. OKAY
(f) The mother is feeding her baby birds some worms. OKAY, but you need to go back to realize that the mother is a bird. The mother bird is feeding her babies some worms.