http://www.bbc.co.uk/news/science-environment-24078179#sa-ns_mchannel=rss&ns_source=PublicRSS20-sa

http://www.sciencedirect.com/science/article/pii/S0003347213003060

[some animals] can observe movement on a finer timescale than bigger creatures, allowing them to escape from larger predators.

Insects and small birds, for example, can see more information in one second than a larger animal such as an elephant.