What operations should a RESTful API have?

I'm new to express and apis, and I'm currently building a RESTful API with Express. For example let's say this is my model.

Sheep = {
 name: String,
 age: Number,
 color: String
}

Aside from basic CRUD operations I saw from this tutorial, like create a Sheep, read a Sheep by id, update a Sheep by id, and remove a Sheep by id are there other operations I should include in my api?

In particular I'm wondering if I should make routes for find a sheep by name/age/color for example and how in best practice I would handle the routes for that.

I'm probably lacking information, but by the tutorial above, the route to find a sheep by id is "/sheeps/:sheepId". How would I make a route to find by name? If I do "/sheeps/:sheepName" would that not be identical to find sheep by id because if I go to my browser and go for example: "localhost:8080/sheeps/someNameOrId" how would the browser or in particular the client side recognize if it is a name or an id?

I'm working with AngularJS as my client if that could help build a more helpful answer.

via S. Jung