Reciprocal actions (el uno al otro)

In Spanish, plural reflexive pronouns like se (they/you all) and nos (we) can express that subjects are doing an action to themselves or to each other.

To clarify that an action is reciprocal (happening to each other), add the phrase el uno al otro after the verb.

The predator and the prey look at each other in the ecosystem.
El depredador y la presa se miran el uno al otro en el ecosistema.
For survival, the wild bird and the spider hunt each other.
Para la supervivencia, el pájaro salvaje y la araña se cazan el uno al otro.

You can also use the adverb mutuamente (mutually). This is especially common when discussing shared actions, benefits, or needs.

In the ecosystem, the flower and the insect benefit each other mutually.
En el ecosistema, la flor y el insecto se benefician mutuamente.
The bee and the flower need each other mutually for the pollen and the nectar.
La abeja y la flor se necesitan mutuamente por el polen y el néctar.

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