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It is probably a Great grey shrike. Or a Loggerhead Shrike: http://www.birds.cornell.edu/AllAboutBirds/BirdGuide/Loggerhead_Shrike.html
The predators of the purple finch are cats, dogs, snakes, eagles and even foxes. Most other animals will not have access to the finch.
thrushes
The collective nouns for thrushes are:a hermitage of thrushesa mutation of thrushesa rash of thrushes
a group of thrushes is called a "mutant"
Killer Shrike was created in 1977.
Magpie Shrike was created in 1831.
Shrike - comics - was created in 1999.
Tiger Shrike was created in 1828.
Gastropods (literally stomach foot), or slugs and snails, are eaten by such creatures as thrushes (which smash them onto rocks). Frogs are one of the main predators for slugs and snails, but beetles, hedgehogs and shrews will all eat them - to name just a few.
Thrushes frequently eat snails. They do this because snails are plentiful and they like them.
The common name for the Turdus bird family is thrushes.