Females with new calves tend to live together, and the calves play together in groups. Giraffes live in loose herds of 10 to 200 animals. Large eyes and strong eyesight combines with their great height to allow giraffes to see threats coming from long distances-and to act as natural lookouts for smaller animals like zebras and wildebeest. One kick from a giraffe's hind leg has been known to kill a lion. On the other hand, the slow-moving giraffe can gallop 35 miles an hour if needed, and its long front legs are surprisingly sturdy. Sleeping is usually done standing up because lying down means having to stand up again-an awkward, time-consuming process. This makes it easy for the giraffe to reach high into the trees for food.īeing tall has its challenges! To get blood up to their heads, giraffes have massive hearts that pump at 2 or 3 times the pressure of a healthy human. The joint that connects the top vertebra to the skull allows the giraffe to tilt its head upward until it is almost perpendicular to the ground. A giraffe has the same number of vertebrae (neck bones) as humans and other mammals do, but each is more than 10 inches long. A giraffe's necks account for more than half of its height. Males stand up to 18 feet tall and females up to 15 feet tall. The giraffe is the tallest land-based mammal in the world. Masai giraffes are the tallest of the giraffe subspecies. They have jagged markings that look like grape or maple leaves. Masai giraffes range in the savannahs across central and southern Kenya and throughout Tanzania. "Reticulated" refers to the net-shaped pattern of their skin, which camouflages them in dense, dry vegetation. Reticulated giraffes live in open woodlands and wooded grasslands in Somalia, northern Kenya and southern Ethiopia. Note: 1.The size of the heart of the animals will be comparative to their body size.Ģ.The characteristics of the heart will be associated with their body functioning.The Oregon Zoo is home to representatives of two subspecies, the reticulated giraffe and the Masai giraffe. This will result in a decrease of oxygen levels in the blood that to be circulated through the body. A specialised circulation in crocodiles results in mixing of oxygen rich blood coming from lungs with the oxygen poor blood coming back from the body. Their heart weighs 1100 to 1200 grams.Therefore, this is the incorrect option.Ĭrocodiles have two aorta, the main artery that supplies the blood to the circulatory system. Option D: Lions are comparatively small animals with 130-190 kg body weight. They are four chambered, and small in size.Therefore, this is the incorrect option. Option C: Crocodile heart is unique even though they share anatomical features with reptiles and mammals. Elephants have the second biggest heart in land animals. Their heart is heavier than that of a giraffe, but the length is less than that of a giraffe. Elephants weigh around 6000 kg, and the weight of their heart is 21-25 kg. Option B: Elephants are the biggest animal in the land. The heart can beat up to 170 beats per minute. This is the correct answer.Ī remarkable network of veins and one way valves are present in the giraffe's circulation system to prevent back flow and random flow of blood. Therefore they have a large and strong heart which weighs up to 11 kg and spans 2 feet, making it the biggest of any land animal. And their neck alone is 6.5 foot in length, therefore pumping blood from lower body to brain requires a lot of energy. Option A: Giraffe is the tallest animal with around five meter high. Blue whale has the largest heart among all animals. As the body size and the distance to the organs increases, it requires more power to pump the blood. Hint: The function of the heart is to pump blood so that the blood reaches the entire body.
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