Crocodiles are the world's largest reptiles. Some species of other animals have become extinct but the crocodiles have not experienced such a fate. All 23 species of crocodiles are still surviving. There are two types of crocodiles found in Australia, freshwater and those found in other wetlands. Their long jaws, protective armor, streamlined bodies and long tails make them very suitable for living in aquatic surroundings like swamps and rivers.
Crocodiles are cold-blooded. Their body temperature changes according to the temperature of the air, water and land of its surrounding. Freshwater crocodiles can be found in the rivers and swamps in some parts of Australia. They have a narrow snout and reasonably straight jawline with even-sized teeth. Unlike other crocodiles, they are not 'man-eaters' and feed mainly on insects, frogs, lizards, turtles, bats, birds, and small mammals.
The wetland crocodiles, on the other hand, are found mainly in the warm climate of Sri Lanka, India as well as other some countries in Southeast Asia and Australia. They have broader snouts than freshwater crocodiles, with an 'up and down' jawline and irregular-sized teeth. It is estimated that they can live for at least 70 to 100 years.
1. The crocodiles are different from all other animals because ______.
(A) none of their species have become extinct
(B) some of their species have become extinct
(C) they have snouts
(D) they live in rivers and swamps
2. There are ______ types of crocodiles in Australia.
(A) 2
(B) 3
(C) 17
(D) 23
3. Why are crocodiles suitable for aquatic surroundings ?
(A) They have even jaws.
(B) They have long jaws and streamlined bodies
(C) They have large snouts
(D) They have uneven jaws.
4. 4. Cold-blooded means ______.
(A) the animal's blood is cold
(B) the surrounding area is cold
(C) the body temperature changes according to the surroundings
(D) the body temperature becomes cold
5. Give a word to replace 'narrow'.
6. Paragraph 2 says 'they are not man-eaters'. What does this mean?
7. Give evidence to show that crocodiles live for a long time.
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Units of Measurement
Remember:
10mm= 1 cm
100cm= 1m
1000m = 1km
Homework- Remember to check your notes and examples to help.
1. 4500m = ______ km
2. 9000m = _________ km
3. 55mm = _________ cm
4. 52.5 m = ______ km
5. The length of a short road is 32m. How many km is the road?
6. Kyle's pencil measures 35mm. How many cm is the pencil?
7. My table is 125mm wide.
a. How many cm is the table?
b. The length of the table is twice the width. What is the length?
8. An ant travels 78mm to reach the fridge.
a. How many cm did he travel.
b. He then ran an additional 105mm. How many cm did he travel in all?
9. The journey from town to my home is 4200m. How many km is this?
10. An athlete runs 6350m. How many km did he run?
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