Primal Awareness (Lvl 17)

You can focus your awareness through the interconnections of nature: you learn additional spells when you reach certain levels in this class if you don’t already know them, as shown in the Primal Awareness Spells table. These spells don’t count against the number of ranger spells you know.

3rd Level: detect magic, speak with animals
5th Level: beast sense, locate animals or plants
9th Level: speak with plants
13th Level: locate creature
17th Level: commune with nature

You can cast each of these spells once without expending a spell slot. Once you cast a spell in this way, you can’t do so again until you finish a long rest.

Source: Unearthed Arcana "Class Features"