Two defense mechanisms squid use is their ink sac, and also their ability to camouflage. Squid can also move really quickly through their siphon, and jet propulsion.
With a few exceptions, no. Generally speaking, there are much healthier coping mechanisms available, and the use of say, denial, displacement, or projection would be considered less than ideal (or...
If on land, swans will most likely try to escape into the water or into the sky. However, if it is a nesting swan, they will attack viciously with their beaks. Many kids poking around nests have had...