This is a common merganser. Mergansers are a type of diving duck. They are perhaps the most skilled fish catchers in the duck world. They are born with this skill and will do all their own hunting, from the point the chicks hatch through adulthood. When they are very young they will be catching aquatic insects and minnows. As adults they will move up to exclusively dining on small fish.
In order to be this skilled at fishing they have to have some specialized abilities and tools. Among them is being very strong swimmers underwater. But they also are specially equipped to hang on to the fish after they catch it. In this picture you cannot tell, but mergansers have sharp serrated edges to their bills. The bill looks a little bit like little saw blades, but each of those points are able to dig into the fish and keep it steady. This allows them to grip the slippery fish without any possibility of losing them.
Sometimes having a good solid grip is critical for people too. For Christians it is essential to have a grip on sound doctrine. A surprising number of people will spend their whole life drifting left and right in what they believe based upon who last influenced them. Of course, the goal should be to learn and accept the truth of Christ, not to adapt to the beliefs of those around you. Yet we such social creatures we are always likely to be influenced by others.
The solution the merganser uses might be useful here too. I believe people need anchor points. Certain key beliefs should be settled in their hearts and minds. These fundamental issues will serve as anchors to their belief system. The believer will recognize falsehood when it disagrees with one of these anchor points. Some of my anchor points include the inspiration of Scripture, the virgin birth, Jesus is eternally deity, Jesus took on humanity, the crucifixion and more. There are a lot of others. The more anchor points you have the steadier your faith will be.
2 Timothy 1:12 (HCSB) says But I am not ashamed, because I know the One I have believed in and am persuaded that He is able to guard what has been entrusted to me until that day.