Doug Perrine / Smalltooth / Wide sawfish {Pristis pectinata} Everglades NP, Florida, Gulf of Mexico, (Non-ex).

Pascal Kobeh / Saw blade shrimp or Tozeuma shrimp (Tozeuma armatum) in a black coral, Sulu Sea, Philippines.

Nick Upton / Tree surgeon cutting branches of a Deodar cedar tree (Cedrus deodara) uprooted in a storm, Wiltshire UK, March. Model released.

Nick Upton / Tree surgeon sawing up the trunk of a big Deodar cedar tree (Cedrus deodara) uprooted in a storm, Wiltshire UK, April. Model released.

Ashley Cooper / Tree surgeons removing trees which fell during a severe storm, Cumbria, England, UK. January 2005

Ashley Cooper / A forwarder, a specialist machine for cutting timber for biofuel in Grizedale Forest, Lake District, England, UK

Ernie Janes / Saw banksia (Banksia serrata) flowers, Hobart botanical garden, Tasmania.

Nick Upton / Social pear sawfly (Neurotoma saltuum) larvae feeding within silk tent on Hawthorn leaves (Crataegus monogyna) near Trowbridge, Wiltshire, UK, June.

Alan Murphy/ BIA / Northern Saw-whet Owl (Aegolius acadicus), Alaska

Dong Lei / Saw-wort / Snow lotus (Saussurea aster) Sanjiangyuan National Nature Reserve, Qinghai Hoh Xil UNESCO World Heritage Site, Qinghai-Tibet Plateau, Qinghai Province, China.

Dong Lei / Saw-wort / Snow lotus (Saussurea medusa) Sanjiangyuan National Nature Reserve, Qinghai Hoh Xil UNESCO World Heritage Site, Qinghai-Tibet Plateau, Qinghai Province, China.

Jeff Foott / Saw dust (frass) at base of Lodgepole Pine tree trunk where Mountain pine beetles (Dendroctonus ponderosae) have drilled through the bark.Resin / pitch indicate the beetles' entry holes. Grand Teton N...