"Slow" marine animals show their secret life under high magnification. Corals and sponges are very mobile creatures, but their motion is only detectable at different time scales compared to ours and requires time lapses to be seen. These animals build coral reefs and play crucial roles in the biosphere, yet we know almost nothing about their daily lives.
"The Big Sisters are post-pubescent Little Sisters that have become unstable in Rapture's environment. Eight years after the events of BioShock, they are charged with maintaining the ecological balance in Rapture. Their extreme level of powers, far beyond normal Plasmid users, can be attributed to their bodies adapting the ADAM created in their bodies as children while they were still developing. Thus they have a much greater natural affinity for the powers that ADAM creates."