Grammar Question: Los habria herbivoros y carnivoros.

I read this in a children's encyclopedia. Why is the 'Los' needed? Habria is the verb. Los is a direct object pronoun. And herbivoros y carnivoros are the subject. Literally in English would it be: There were (them) herbivores and carnivores. Where am I wrong? Is 'los habia' just a set phrase used in this context? Thanks for the help!

submitted by /u/Langred
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