Thy took this incredible shot while accompanying whale researchers who are doing excellent work in helping whales by tagging, cataloging, and studying the killer whales in Antarctica. (Viewing in HD recommended) Arrows are used to attach GPS based location tags to the dorsal fins and as you can see the whales do not react to it. I imagine it's similar to a human getting their ears pieced. Tags stay in place for about a month before falling off and help track the whales migration patterns. Biopsy arrows on the other hand collect a tiny sample of blubber on the hollow tip of the arrow to help scientists determine their nutrition, health and diet. Every arrow used is accounted for under strict permits and regulations.