yes its quite common, as are loxes and wolves. Every animal type has its own best practices.

for boars try to keep them calm by avoiding mobs while on route, same for loxes.
swamp is particularly annoying because of leeches they will generate freightened status making the boars run away. so avoid swamp coasts and hug the deep waters at all times. depart in the morning. daylight is better since spawn rates for mobs and sea snakes are lower. make sure to explore the route before sailing so you can have the best approach to your base. calm weather is also beneficial. its a fun part of the game. one two-star boar is enough to start breeding so as stated before, best to take a few, so at least one survives the trip :D