Dietary Analysis of the Barn Owl. Why? Barn Owl decrease in Pennsylvania and throughout its range 1...

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Dietary Analysis of the Barn Owl

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Page 1: Dietary Analysis of the Barn Owl. Why? Barn Owl decrease in Pennsylvania and throughout its range 1 st PA Breeding Bird Atlas 1983-89.

Dietary Analysis of the Barn Owl

Page 2: Dietary Analysis of the Barn Owl. Why? Barn Owl decrease in Pennsylvania and throughout its range 1 st PA Breeding Bird Atlas 1983-89.

Why?Barn Owl decrease in Pennsylvania and throughout its range

1st PA Breeding Bird Atlas 1983-89

Page 3: Dietary Analysis of the Barn Owl. Why? Barn Owl decrease in Pennsylvania and throughout its range 1 st PA Breeding Bird Atlas 1983-89.

2nd atlas 2004-2008

Page 4: Dietary Analysis of the Barn Owl. Why? Barn Owl decrease in Pennsylvania and throughout its range 1 st PA Breeding Bird Atlas 1983-89.

Barn Owl aka Monkey-Faced Owl

Page 5: Dietary Analysis of the Barn Owl. Why? Barn Owl decrease in Pennsylvania and throughout its range 1 st PA Breeding Bird Atlas 1983-89.

Owl Pellets• Not poop!• Undigested bones and fur• Pellet ejection at the nest

http://www.youtube.com/watch?v=waLiTmLr1nM
Page 6: Dietary Analysis of the Barn Owl. Why? Barn Owl decrease in Pennsylvania and throughout its range 1 st PA Breeding Bird Atlas 1983-89.

Meadow Vole Microtus pennsylvanicus

Page 7: Dietary Analysis of the Barn Owl. Why? Barn Owl decrease in Pennsylvania and throughout its range 1 st PA Breeding Bird Atlas 1983-89.

Likely things you’ll find...

• Meadow Vole, Microtus pennsylvanicus• Masked Shrew, Sorex cinereus• Star-nosed Mole, Condylura cristata

Page 8: Dietary Analysis of the Barn Owl. Why? Barn Owl decrease in Pennsylvania and throughout its range 1 st PA Breeding Bird Atlas 1983-89.

Meadow VoleMicrotus pennsylvanicus

• Herbivore• Widespread• Active year-round,

mostly nocturnal• ~5 pups, 1-5 times

per year

Page 9: Dietary Analysis of the Barn Owl. Why? Barn Owl decrease in Pennsylvania and throughout its range 1 st PA Breeding Bird Atlas 1983-89.

Meadow Vole

http://www.discoverlife.org/nh/tx/Vertebrata/Mammalia/Muridae/Microtus/pennsylvanicus/images/Microtus_pennsylvanicus.ventral.640.jpg
Page 10: Dietary Analysis of the Barn Owl. Why? Barn Owl decrease in Pennsylvania and throughout its range 1 st PA Breeding Bird Atlas 1983-89.

Masked ShrewSorex cinereus

• Maximum size ~8 grams

• Active year round• May eat own

weight in a day

Page 11: Dietary Analysis of the Barn Owl. Why? Barn Owl decrease in Pennsylvania and throughout its range 1 st PA Breeding Bird Atlas 1983-89.

Masked Shrew

Page 12: Dietary Analysis of the Barn Owl. Why? Barn Owl decrease in Pennsylvania and throughout its range 1 st PA Breeding Bird Atlas 1983-89.

Sorex monticolus

Page 13: Dietary Analysis of the Barn Owl. Why? Barn Owl decrease in Pennsylvania and throughout its range 1 st PA Breeding Bird Atlas 1983-89.

Sorex monticolus

Page 14: Dietary Analysis of the Barn Owl. Why? Barn Owl decrease in Pennsylvania and throughout its range 1 st PA Breeding Bird Atlas 1983-89.

Star-nosed Mole

Page 15: Dietary Analysis of the Barn Owl. Why? Barn Owl decrease in Pennsylvania and throughout its range 1 st PA Breeding Bird Atlas 1983-89.

Southern Red-Backed VoleMyodes gapperi

Page 16: Dietary Analysis of the Barn Owl. Why? Barn Owl decrease in Pennsylvania and throughout its range 1 st PA Breeding Bird Atlas 1983-89.

House MouseMus musculus

Page 17: Dietary Analysis of the Barn Owl. Why? Barn Owl decrease in Pennsylvania and throughout its range 1 st PA Breeding Bird Atlas 1983-89.

White-footed MousePeromyscus leucopus

Page 18: Dietary Analysis of the Barn Owl. Why? Barn Owl decrease in Pennsylvania and throughout its range 1 st PA Breeding Bird Atlas 1983-89.

Deer MousePeromyscus maniculatus

Page 19: Dietary Analysis of the Barn Owl. Why? Barn Owl decrease in Pennsylvania and throughout its range 1 st PA Breeding Bird Atlas 1983-89.

Meadow Jumping MouseZapus hudsonius

Page 20: Dietary Analysis of the Barn Owl. Why? Barn Owl decrease in Pennsylvania and throughout its range 1 st PA Breeding Bird Atlas 1983-89.

Woodland Jumping MouseNapaeozapus insignis

Page 21: Dietary Analysis of the Barn Owl. Why? Barn Owl decrease in Pennsylvania and throughout its range 1 st PA Breeding Bird Atlas 1983-89.

Northern Short-tailed ShrewBlarina brevicauda

Page 22: Dietary Analysis of the Barn Owl. Why? Barn Owl decrease in Pennsylvania and throughout its range 1 st PA Breeding Bird Atlas 1983-89.

Masked ShrewSorex cinereus

Page 23: Dietary Analysis of the Barn Owl. Why? Barn Owl decrease in Pennsylvania and throughout its range 1 st PA Breeding Bird Atlas 1983-89.

Eastern CottontailSylvilagus floridanus

Page 24: Dietary Analysis of the Barn Owl. Why? Barn Owl decrease in Pennsylvania and throughout its range 1 st PA Breeding Bird Atlas 1983-89.

Eastern ChipmunkTamias striatus

Page 25: Dietary Analysis of the Barn Owl. Why? Barn Owl decrease in Pennsylvania and throughout its range 1 st PA Breeding Bird Atlas 1983-89.

Norway RatRattus norvegicus

Page 26: Dietary Analysis of the Barn Owl. Why? Barn Owl decrease in Pennsylvania and throughout its range 1 st PA Breeding Bird Atlas 1983-89.

European StarlingSturnus vulgaris

Page 27: Dietary Analysis of the Barn Owl. Why? Barn Owl decrease in Pennsylvania and throughout its range 1 st PA Breeding Bird Atlas 1983-89.

House SparrowPasser domesticus


BARN OWL PELLET LAB

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