SHORT-BEAKED ECHIDNA VS RED BELLY BLACK SNAKE
Both of these adaptations have different adaptations due to the environment they live is and their predators. Snakes Behavioural adaptation is being able to widen their jaw, Echidnas don't need this adaptation due to the foods they eat, as the Echidna only eat animals smaller then itself like ants and grubs. As the snake eats animals lager then itself and therefor they don't need the same adaptation.
The snake can live for up to a few months without eating where as the Echidna eats daily due to the small amount of food it eats each day, the Snake has adapted to not eat for months after eating a big consumption of food.
Both of these adaptations have different adaptations due to the environment they live is and their predators. Snakes Behavioural adaptation is being able to widen their jaw, Echidnas don't need this adaptation due to the foods they eat, as the Echidna only eat animals smaller then itself like ants and grubs. As the snake eats animals lager then itself and therefor they don't need the same adaptation.
The snake can live for up to a few months without eating where as the Echidna eats daily due to the small amount of food it eats each day, the Snake has adapted to not eat for months after eating a big consumption of food.