يراقب الزائر الحياة الفطرية.

Because this is a normal verbal sentence in Arabic. A very common word order in Modern Standard Arabic is:

verb + subject + object

So:

• يراقب = watches / monitors
• الزائر = the visitor
• الحياة الفطرية = the wildlife

Arabic can also use subject + verb + object, but starting with the verb is especially common in formal written Arabic.

يراقب is in the imperfect form. In English, that often corresponds to:

• is watching
• watches
• monitors
• sometimes even will watch, depending on context

In this sentence, without extra context, it most naturally means something like watches or is watching.

The dictionary form is راقب, which is the past tense verb meaning watched / monitored.

So the basic pair is:

• راقب = he watched / monitored
• يراقب = he watches / is watching

This verb comes from the root ر-ق-ب, which has to do with watching, observing, or monitoring.

In this sentence, the normal Arabic word order tells you that:

• يراقب = verb
• الزائر = subject
• الحياة الفطرية = direct object

So the first noun after the verb is understood as the subject, and the next noun phrase is the object.

If full case endings were written, that would make it even clearer:

• الزائرُ = subject, nominative
• الحياةَ الفطريةَ = object, accusative

In everyday unvowelled writing, those endings are usually not shown, so learners often rely on word order and context.

Because الفطرية is an adjective describing الحياة, and in Arabic adjectives must agree with the nouns they describe in definiteness as well as gender and number.

So:

• الحياة = the life
• الفطرية = the wild / natural

Together they form a definite phrase: the wildlife.

If the noun is definite, the adjective must also be definite.

Because it agrees with الحياة, and حياة is a feminine singular noun.

Arabic adjectives agree with the noun they describe in:

• gender
• number
• definiteness
• case

So since الحياة is feminine singular and definite, the adjective must also be feminine singular and definite:

• الحياة
• الفطرية

Yes, it is a very common expression meaning wildlife.

Literally, it is something like:

• الحياة = life
• الفطرية = natural / instinctive / wild

But as a full phrase, الحياة الفطرية is the standard Arabic way to say wildlife.

So it is best learned as a set phrase, not just as two separate words.

In الزائر, the ل of الـ is not pronounced fully, because ز is a sun letter.

So it is pronounced roughly:

az-zāʾir

not

al-zāʾir

By contrast, in:

• الحياة → al-ḥayāh
• الفطرية → al-fiṭriyya

the ل is pronounced, because ح and ف are moon letters.

Arabic usually does not need a separate object marker for a normal direct object. Instead, the object is shown by:

1. word order
2. case endings in fully vocalized Arabic

So in a fully vocalized version:

• الزائرُ = subject
• الحياةَ الفطريةَ = object

In normal writing, the short vowel endings are omitted, but the sentence is still understood from structure and context.

It primarily means visitor.

Depending on context, it could sometimes refer to someone visiting a place, museum, park, or country. But the more specific word for tourist is usually سائح.

So in this sentence, الزائر is best understood as the visitor, unless the broader context makes it clear that it means a tourist.

In Arabic, when the verb comes before the subject, the verb is often kept in the singular form, even if the subject is plural.

In your sentence the subject is singular anyway, so there is no issue:

• يراقب = singular masculine
• الزائر = singular masculine

But this sentence is a good example of the general rule that verb-first sentences often use a singular verb form before the subject.