1. One for all and all for one: the energetic benefits of huddling in endotherms;C Gilbert;Biol Rev Camb Philos Soc,2010
2. Roosting aggregations of Bushtits in response to cold temperatures;SM Smith;Condor,1972
3. Some causal and functional correlates of creching in young white pelicans;RM Evans;Canadian Journal of Zoology,1984
4. Temperature-dependent reduction of individual distance in captive House-Sparrows;KG Beal;The Auk,1978
5. Absence of" individual distance" in three swallow species;WR Meservey;The Auk,1976