The challenge of challenge: Can problem solving opportunities enhance animal welfare?. Meehan, C. & Mench, J. Appl. Anim. Behav. Sci, 102:246–261, 2007.
bibtex   
@article{meehan_challenge_2007,
	title = {The challenge of challenge: {Can} problem solving opportunities enhance animal welfare?},
	volume = {102},
	language = {en},
	journal = {Appl. Anim. Behav. Sci},
	author = {Meehan, C.L. and Mench, J.a},
	year = {2007},
	pages = {246--261},
}

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