Whales are K- selected species, which means they are large slow-growing long-lived species with large habitat ranges and low fecundity (birth rate). Most of their energy goes into growth and they are slow to mature. If they are exploited, they are slow to replenish their population.
Chickens are r-selected species, meaning they are small fast-growing, short lived species with high fecundity and quick maturation. This means that populations can be replenished quickly when exploited for food.
Silly question anyway.