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Adaptations However their aquatic lives have produced a number of adaptations: - Torpedo shaped, streamlined for ease of movement and to reduce drag lateral expansion of the integument of the tail to form a pair of flukes, these caudal fins serve as the main propulsive surface. - Neck vertebratae are fused into a single mass giving the neck region an ill-defined external appearance. - External hinds limbs absent, forelimbs modified to form flippers (pectoral fins), with fingers enclosed within a common integument. - The back bears an extension of the integument forming a triangular or sickle - shaped dorsal fin. - Ear pinnae are absent, the external ear is a small hole which reduces friction. - In toothed cetaceans the upper lip is hypertrophied to form a large bulbous mass of fat, the ‘melon’. Hair has been virtually lost and to help maintain a stable body temperature have an insulating layer of subcutaneous blubber. - The nostrils ‘blowhole’ are situated on the top of the head allowing a quick breath at the surface. For diving the blowhole is closed by a special ring of muscle to prevent water flooding the nasal passage.
- The eyes of cetaceans are protected from the salt water by a greasy secretion from the tear ducts, and the curvature of the lens can be changed to allow focusing in and out of water. - Cetaceans are able to attain large size, as water supports their body weight. The skeleton is formed of relatively light spongy bone, which would be inadequate to support the equivalent weight on land.
Page 2 and 3: B D c r e a t i v e
Page 4 and 5: “To say nothing, to do nothing, s
Page 6 and 7: “What a country chooses to save i
Page 8 and 9: Mount Teide • Mount Teide is the
Page 10 and 11: What are the volunteer duties? You
Page 12 and 13: Activities Tenerife is an extraordi
Page 14 and 15: Accomodation Accomodation is provid
Page 16 and 17: AWF 27 Whales Species “We do not
Page 18 and 19: Profile Weight at Birth: 60 Kg (135
Page 20 and 21: Behaviour and Social Structure: - S
Page 22 and 23: Travelling - when the pod are swimm
Page 24 and 25: Pan-tropical Spotted Dolphin Stenel
Page 26 and 27: Boat Rules 1. When out on the boats
Page 28 and 29: Data Sheet (2)
Page 30 and 31: The Data Explained 1. In the middle
Page 32 and 33: General Activities Logging: Animals
Page 34 and 35: Lighting is also important when try
Page 36 and 37: Data Sheet after the boat Data Proc
Page 38 and 39: What is Pollution? “The act of ma
Page 40 and 41: Habitat Degradation Natural habitat
Page 42 and 43: Human exploitation of whales dates
Page 44 and 45: AWF General Information “Washing
Page 48 and 49: The Food Chain - Plankton means ‘
Page 50 and 51: Feeding The ways different Cetacean
Page 52 and 53: Water balance in marine mammals - F
Page 54 and 55: “Earth provides enough to satisfy
Page 56 and 57: The most frequent turtle in the Can
Page 58 and 59: Sea Birds Common birds seen on Tene
Page 60: B D c r e a t i v e With thanks to

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