id	author	title	date	pages	extension	mime	words	sentences	flesch	summary	cache	txt
cord-279146-8d3dym7g	Bowlin, Melissa S.	Grand Challenges in Migration Biology	2010-04-21		.txt	text/plain	11636	551	41	Such long-term knowledge and expertise will, over time, naturally lead to integrative studies, combining knowledge about different parts of the system to improve our understanding not only of the entire migration process, but, for example, how it connects to other life-history traits and its potential relevance for conservation. Integrating theoretical models Pennycuick (1998) argued that, in addition to field observations and laboratory-based studies, we need theoretical models to completely understand bird flight; the same is true for animal migration. It has often been observed that birds do not gain weight for one or more days following arrival at stopover sites, but it was unclear whether this search/settling behavior reflected time required to find the best feeding conditions, or a period of physiological recovery (Klaassen and Biebach 1994; Alerstam and Hedenström 1998; Guglielmo et al.	./cache/cord-279146-8d3dym7g.txt	./txt/cord-279146-8d3dym7g.txt