Conjure Animals 5e Who Chooses. The design intent for options like these is that the spellcaster chooses one of them, and then the dm decides what creatures appear that fit the chosen option. Some spells of this sort specify that the spellcaster chooses the creature conjured.
One beast of challenge rating 2 or lower; Conjure animals, conjure celestial, conjure minor elementals, and conjure woodland beings are just a few examples. Conjure animals, conjure celestial, conjure minor elementals, and conjure woodland beings are just a few examples.
My dm, though it hasn't come up somehow, will 100% allow me to choose what appears with conjure animals, for what that's worth.
Some spells of this sort specify that the spellcaster chooses the creature conjured. The design intent for options like these is that the spellcaster chooses one of them, and then the dm decides what creatures appear that fit the chosen option. If you want to get that appears you have to choose one of the following options. A cruel dm could just say you get suffocating seahorses, that's it.