If you kill a boss or special enemy, they will usually drop 3 or more eggs. You can hold one at a time, but you should try to focus on holding that position for a while. Salmon will pick up the egg and run away if left, so you should call other players for help.

Press the ARROW keys and say "This way!" Other players will know to come and help. Likewise, be careful when other players use the same command because you need to work with them during those tough times. If you're playing with friends, it's much easier to communicate.