134 SOME COMMON MAMMALS. 



nearly all of the same length, are very strong and sharp. 

 Altogether the limb shows remarkable adaptations to the 

 special work it performs, and a.11 these points should be 

 verified by the pupils. 



In this connection it should be mentioned that the 

 breastbone is ridged, thus supplying additional surface for 

 attachment of the strong muscles which move the limbs. 

 We recall of course the keel in the breastbone of flying 

 birds, which serves the same purpose. The great develop- 

 ment of this fore limb is further emphasised when we 

 note the sleuderness of the hind limbs of this remarkable 

 creature. 



The mole has a short and somewhat insignificant-looking 

 tail. 



The teacher who is interested in the subject might endea- 

 vour to procure a skeleton of a mole, the further study of 

 which will reveal other peculiarities. 



Pupils should be asked to make drawings illustrative of 

 the following : 



The shape of the body. 



The under surface of the head, to show 



position of nostrils and sensory hairs, 



position of mouth, 



pointed teeth with protecting " curtain." 



The fore paw. 



BATS. 



There are twelve species of Bats occurring in the British 

 Isles, and at least two others are reputed to have been 

 found here. All the bats of this country are insect feeders, 

 but the larger species occurring in tropical regions, such as 

 India and Madagascar, are fruit-eating. Bats are for the 

 most part nocturnal or twilight animals ; they hibernate 

 usually in large companies in church towers, old ruins, and 

 other deserted places, generally hanging by the feet with 

 head turned downwards. Their sleep is deep, and they 



