Three different warbler species live in the same tree. One species feeds at the top of the tree, the second species feeds in the middle part of the tree, and the third species feeds at the bottom of the tree. Do all three species occupy the same niche? Explain.

No, they don't

Explanation:

Organisms of the different species can cohabit in the same habitat but contribute differently to the ecosystem they are found. This individual organism's contribution is referred to as NICHE. Ecological niche is the role of an organism in the ecosystem it's found. An organism's niche can include; how it contributes to the environment, what it does to survive, what it feeds on, how it interacts with other species etc.

In the case of these three Warbler species occupying the same habitat (tree), each Warbler species feeds on different parts of the tree (top, middle and bottom) which contains different organisms. This means that the three Warbler species are predators to three different organisms.

Since they feed on different organisms to survive, it can be said that they occupy different niche even if they share same habitat.

that is wrong, its not thymus.

in 1859, charles darwin set out his theory of evolution by natural selection as an explanation for adaptation and speciation. he defined natural selection as the "principle by which each slight variation [of a trait], if useful, is preserved".