What there instruments were used to represent in saint saens piece?

The Saint-Saens piece you are referring to is likely "The Carnival of the Animals", a suite of fourteen movements for two pianos and orchestra. Each movement represents a different animal, and Saint-Saëns used specific instruments to represent each one.

Here are the instruments used to represent some of the animals in "The Carnival of the Animals":

- Lion: Two pianos, double basses, and cymbals

- Elephant: Two pianos, tuba, and double basses

- Tortoises: Two pianos and xylophone

- Aquarium: Two pianos, glass harmonica, and celeste

- Kangaroo: Two pianos and xylophone

- Cuckoo in the Woods: Two pianos, two flutes, and clarinet

- Aviary: Two pianos and bird whistles

- Pianists: Two pianos

These are just a few examples, as there are fourteen movements in total, each representing a different animal with its own unique instrumentation.