An excellent picture of a brown hare mother (Lepus europaeus) suckling. NB rabbits also have very brief suckling durations (around 3 minutes a DAY – yes, that figure is correct). That means that rabbit pups have to find the nipple very quickly. There’s a key pheromone involved in this, helping to guide the pup to the nipple. More info in my Final Level course on Chemical Communication in Animals.