Example 1:
Human being (Man) is an omnivore, i.e. its feeds on both plants and animals.
When man feeds on plant, he becomes a herbivore (occupying the Second Trophic level).
When he eat animals (meat), he becomes a carnivore thus occupying higher tropic level in the food chain.
Example 2:
Consider the following three food chains:
First Chain: Grass (T1) → Grasshopper (T2) → Lizard (T3) → Hawk (T4)
Second Chain: Grass (T1) → Grasshopper (T2) → Hawk (T3)
Third Chain: Grass (T1) → Grasshopper (T2) → Frog (T3) → Snake (T4) → Hawk (T5)
In the First food chain, Hawk occupies the Fourth Trophic level, i.e. it is a Secondary carnivore.
In the Second food chain, Hawk occupies the Third Trophic level, i.e. it is a Primary Carnivore.
In the Third food chain, Hawk occupies the Fifth trophic level, i.e. it is a Top-level carnivore.
Thus, Humans (Man) and Hawk occupies more than one trophic level in the ecosystem.
