88 TROPICA!. WILD LIFE IN BRITISH GUIANA 



(Groups found ty})it'ally in more tlian one Zone) 



Ground Low Jungle Mid Jungle T?'ee-tops 



(()--2() feet) (20-70 feet) (70-200 feet) 



Goatsuekers Goatsuekers ITuniminohirds Flyeateliers 



I-Iuniininol)ir(ls Flyeateliers Hummingbirds 

 Tanagers Tanagers 



INIammals ])ermit a similar mode of representation of 

 altitudinal distribution : 



Anteaters Opossums Anteaters Red Howlers 



Armadillos Slotlis Beesa JNIonkeys 



Tapirs Bats 



Pecearies Coatis 



Deer . Squirrels 



Cats Marmosets 



Dogs Kinkajous 



Galictis 



Rodents 



Returning to the birds of the jungle. Accepting 1 to 

 10 as the gradation of hght from the dimmest part of the 

 jungle to fidl sunlight, and with the same divisions as a 

 basis, we can form an interesting table of relative percent- 

 ages of dull and brilliant birds: 



Gradation 

 of Light 

 Percentao-e 



of Brio'ht 



ONE THREE FIVE TEN 



f-i' 



j-i' 



Birds 8 50 83 



This by no means indicates that all the brilliant birds 

 are consi)ieuous in their native haunts or that the dull ones 

 are correspondingly protected by their pigment. A quad- 

 rille wren hopping about and filling the low jungle with its 

 wonderful unearthly melody, is a most conspicuous bit of 

 life in spite of its garb of brown and buflf. A parrakeet 

 with s])ots of yellow on vivid green, opalescent in the hand, 

 is but one leaf among a million in the tree-tops. 



