Here's what Birds of North America Online says for roosting behavior in Snow 
Bunting:
*******
Sleeping, Roosting, Sunbathing
In winter, roosts in slight scrapes in snow in open areas; average distance 
between roosting birds 2.5 m, rarely <30 cm (Vincent and Bédard 1976). Only 
roosts behind snowdrifts in lee of wind when temperatures below -7°C; huddling 
together not observed, even under extreme conditions (Vincent and Bédard 1976). 
During storms, passively covered with snow; during extreme conditions (-35°C), 
burrows into snow (Bagg 1943). Rarely observed roosting in trees (Parmelee 
1968). In early spring on breeding grounds, roosts in loose aggregations in 
cracks and holes on cliffs (Parmelee 1968); 50–80 birds roosted in narrow 
cracks of southwest-facing, exposed cliffs at 2 Greenland roosts in early 
spring (Meltofte 1983); after territories established, male roosts alone in 
crack or hole on own territory .
********

BNA has nothing specific about winter Horned Lark roosts, but I would presume 
they are also on the ground.

Re. Lapland Longspur winter roosting:
********
Sleeping, Roosting, Sunbathing
Even during continuous daylight during breeding season, males roost singly on 
song perch rocks for 3–5 h in the middle of the “night” (20:30–01:30 MST at 
Sarcpa Lake; RM); females roost at nest (Hussell 1972); during cold weather, 
several pairs roosted communally in grass tussocks (Watson 1957). Roosting 
sites during migration and winter unknown.

******

Marie


Marie Read Wildlife Photography
452 Ringwood Road
Freeville NY  13068 USA

Phone  607-539-6608
e-mail   m...@cornell.edu

http://www.marieread.com
http://www.agpix.com/mari
________________________________________
From: bounce-7607236-5851...@list.cornell.edu 
[bounce-7607236-5851...@list.cornell.edu] On Behalf Of John Greenly 
[j...@cornell.edu]
Sent: Saturday, December 25, 2010 5:10 PM
To: cayugabirds
Subject: [cayugabirds-l] Rafferty Rd

Stopped by Rafferty Rd late this afternoon.  2 N HARRIERS active, didn't find 
any owls.  At 4:15  huge, spread-out flocks of HORNED LARKS  and SNOW BUNTINGS 
came from somewhere south, flew over and appeared to be headed for the wooded 
area north of the Rafferty Rd fields.  I counted 360, but there were already 
some passed by and uncountable in the distance when I got there.  What sort of 
a place do these species tend to like for the night's roost- anybody know?

--John Greenly
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