Fuglen flyver til reden med mad til ungen.

In Danish, the definite article is usually attached to the end of the noun instead of standing in front of it.

• en fugl = a bird
• fuglen = the bird

This is very common in Danish:

• en rede → reden
• en unge → ungen

So English uses a separate word, but Danish often uses a suffix.

The basic indefinite singular forms are:

• en fugl = a bird
• en rede = a nest
• en unge = a chick / young one / baby animal

In the sentence, all three appear in the definite singular:

• fuglen = the bird
• reden = the nest
• ungen = the chick

Flyver is the present tense of at flyve = to fly.

Danish present tense is often formed with -r or -er, depending on the verb form:

• at flyve → flyver = flies / is flying

In a sentence like this, Danish simple present can often translate as either English simple present or present progressive, depending on context:

• Fuglen flyver = The bird flies / The bird is flying

Because the sentence has two different to relationships:

• til reden = to the nest
  This tells you the direction or destination of the bird’s movement.

• til ungen = for the chick / to the chick
  This tells you who the food is intended for.

So even though both are til, they do different jobs in the sentence.

Because mad here means food in a general, non-specific sense.

• med mad = with food
• med maden = with the food

English does something similar:

• with food = general
• with the food = specific food already known from context

So med mad til ungen means the bird is carrying food for the chick, not a particular previously mentioned portion of food.

In Danish, til is very common when talking about something intended for someone, especially with things like food, gifts, letters, and similar items.

• mad til ungen = food for the chick

You may sometimes see for in other contexts, but here til is the most natural choice. It suggests destination or intended recipient.

So in this sentence:

• med mad til ungen sounds natural and idiomatic.

Because it makes the most natural meaning:

• Fuglen flyver til reden = the bird flies to the nest
• med mad til ungen = with food for the chick

So the whole sentence breaks nicely into:

• subject: Fuglen
• verb: flyver
• destination: til reden
• accompanying phrase: med mad til ungen

The phrase til ungen is understood as modifying mad, not flyver. In other words, it is the food that is for the chick.

Yes. This is a very normal main-clause order:

• Subject + verb + other information

So:

• Fuglen = subject
• flyver = verb
• til reden med mad til ungen = the rest

This is the default pattern in a simple statement.

Yes, but then the sentence structure has to follow Danish verb-second word order.

For example, you could front the destination:

• Til reden flyver fuglen med mad til ungen.

That is still grammatical, but it sounds more marked or literary because til reden is being emphasized.

You cannot just move things around freely the way English learners sometimes want to. Danish main clauses normally keep the finite verb in second position.

Unge is a general word for a young one, especially an animal baby. In this sentence, it is most naturally understood as the chick or the baby bird.

So:

• en unge = a young one / chick
• ungen = the chick / the young one

It is a broader word than a very specific biological term, which is why it is common in everyday Danish.

Because Danish handles articles differently.

A noun can appear:

• with an indefinite article: en fugl
• with a definite ending: fuglen
• with no article at all, especially for mass nouns or abstract nouns: mad

So in one short sentence you can see all three patterns:

• Fuglen = definite noun
• reden = definite noun
• mad = no article, because it is a mass noun
• ungen = definite noun

That mix is completely normal in Danish.