By Michael Augee, Brett Gooden, Anne Musser
The echidna is likely one of the world’s so much awesome creatures. it's a residing fossil whose kin have been jogging the earth over a hundred million years in the past. just like the platypus, it's a mammal that lays eggs. And, like any mammals, it has fur and produces milk. This publication describes the echidna’s way of life and the diversifications that experience made it such a success. It attracts at the most recent examine into those unfamiliar beings, masking their evolution, anatomy, senses, copy, behaviour, feeding behavior and metabolism. The authors demonstrate a few attention-grabbing new findings, displaying how echidnas are masters in their surroundings, and never easily a few type of mammal ‘test version’ that went flawed. a last bankruptcy on conservation contains info on captive vitamin and administration.
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Extra info for Echidna: Extraordinary Egg-Laying Mammal (Australian Natural History)
Abbreviations: av = anterior surface of the vitreous humour, ch = choroid, cp = ciliary process, i = iris, l = lateral limit of the cornea, m = rectus muscle, os = ora serrata retinae (the anterior limit of the retina), r = retina, s = sphincter, sc = scleral cartilage (black), sf = fibrous layer of sclera, sl = suspensory ligament.
In the echidna it terminates at the level of the 7th thoracic vertebra whereas in the human it ends between lumbar vertebrae 1 and 2. It has been suggested that this shorter length in the echidna allows it to roll up into its hyperflexed defensive posture without over-stretching the spinal cord. A greater proportion of the stretching is presumably taken up by the possibly more resilient sheaf of nerve roots of the cauda equina which radiate from the distal end of the spinal cord. The arrangement of the nerve cells in the echidna’s spinal cord is similar to eutherian mammals.
In both monotreme families the skull bones fuse together early in life, obliterating or obscuring suture lines. This makes the task of identifying the skull bones difficult and has led to some confusion in the identification of the component skull bones. The dorsal and lateral sides of the skull roof bear scars for the origin of wide, strap-like muscles that run posteriorly from the skull to insert onto the Skeletal anatomy 39 shoulder, helping to give echidnas a somewhat neckless appearance. The zygomatic arches are thin and weak due to the reduction of the musculature required for chewing.
Echidna: Extraordinary Egg-Laying Mammal (Australian Natural History) by Michael Augee, Brett Gooden, Anne Musser