Several varieties, when alarmed, emit a peculiar odor, by which the people become aware of their presence in a house.

We have also the cobra ('Naia haje', Smith) of several colors or varieties.

When annoyed, they raise their heads up about a foot from the ground, and flatten the neck in a threatening manner, darting out the tongue and retracting it with great velocity, while their fixed glassy eyes glare as if in anger.

There are also various species of the genus 'Dendrophis', as the 'Bucephalus viridis', or green tree-climber.

They climb trees in search of birds and eggs, and are soon discovered by all the birds in the neighborhood collecting and sounding an alarm.* Their fangs are formed not so much for injecting poison on external objects as for keeping in any animal or bird of which they have got hold.