The Sea-Dayaks have many good qualities that are more or less lacking in the other inland tribes. They are industrious, honest and thrifty, sober and cheerful, and comparatively moral. But the characteristics that mainly distinguish them are energy and independence. They are exceedingly sensitive, especially the women, and will seek refuge from shame in suicide;[30] like the Malays the men will sometimes, though not often, _amok_ when suffering from depression caused by grief, shame, or jealousy, for in the East this peculiar form of insanity is by no means confined to the Malay as is popularly supposed.[31] Amongst them general social equality exists, and it is extended to their women. They do not suffer their chiefs to abuse their powers as the Kayan and Kenyah chiefs are allowed to do, but they are quite ready to submit to them when justness and uprightness is shown. They are superstitious and restless, and require a firm hand over them, and, "being like truant children, take a great advantage of kindness and forbearance, and become more rebellious if threats are not carried into execution." This was the advice given by the present Rajah to the Netherland officials some years ago. Their inherited desire for human skulls, and their old savage methods of obtaining them, still, in a degree, have a strong hold on the Sea-Dayak character, but against this it can be said to their credit that they are free from cruelty, and never torture a captive as do the Kayans and other tribes. They are kindly to their captives, and treat them as members of the family; and they were a peaceable people before they were led astray by the half-bred Arabs and the Malays.
The Sea-Dayaks are the collectors of jungle produce, in search of which they go on expeditions far into the interior—to Sumatra, the Malayan States, and North Borneo—and are away for months at a time.
The Dayak custom of head-hunting is founded on the same principle as that of scalp-hunting among the North-American Indians. A young man formerly found it difficult to obtain a wife till he had got at least one head to present to the object of his heart as token of his prowess; but it was quite immaterial whether the head was that of man or woman, of old or young. If a Dayak had lost a near relative it became his duty to obtain a head, for until this was accomplished, and a head feast had been given, the family must remain in mourning, and the departed relative would have no attendant in Sembayan (the shades); and so in the event of a chief dying it was incumbent upon the warriors of the tribe to procure one or more heads, in order that his spirit should be properly attended by the spirits of those sacrificed in his honour. Thus head-hunting became more or less a natural instinct, and an obligatory duty.