Avis

You create a small bird with 1 hit points. As a bonus action on each of your turns, you may send it up to 30 ft. flying or 5 ft. walking. The bird may not pick up items, but it can make an attack using your spellcasting attack modifier to deal damage equal to it's hit points. The spell ends when the bird/swarm dies.

At Higher Levels:

When casting this spell with a spell slot of 2nd level or higher, the bird will become a swarm, with the number of birds and hit points equal to the level of spell slot this spell was cast with. As an action on you one of your turns, you may have any number of birds in the swarm break off to create an additional swarm. All swarms can be commanded with a single bonus action.