Question

select the infinitive or infinitive phrase.
killer whales, or orcas, use a variety of techniques for hunting marine mammals and other prey; some may even beach themselves to ambush seals on the shore.
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Explanation:

An infinitive phrase starts with the base form of a verb preceded by "to", and includes any associated objects or modifiers. In the given sentence, the phrase starting with "to" that functions as a purpose clause is the infinitive phrase.

Answer:

to ambush seals on the shore