It is illegal to work without a valid work permit in Canada. A work permit is a legal document issued by the Canadian government that allows an individual to work in Canada for a specific employer, occupation, and period of time. It is important to obtain a work permit before starting work in Canada, as failure to do so can result in serious consequences, including deportation and being barred from returning to Canada.
It is important to note that while these occupations do not require a work permit, foreign nationals who engage in these activities are still subject to Canadian Immigration Laws and Regulations, and may require other types of permits or visas to enter Canada. It is also important to ensure that you comply with all applicable Canadian laws and regulations while you are in Canada.