Treatment	% of experimental material remained in nest
White pebbles	25.1
White pebbles	15.8
White pebbles	4.0
White pebbles	22.8
White pebbles	37.2
White pebbles	5.8
White pebbles	3.8
White pebbles	20.4
White pebbles	8.6
White pebbles	2.5
White pebbles	7.5
Light grey pebbles	25.7
Light grey pebbles	27.4
Light grey pebbles	13.2
Light grey pebbles	12.8
Light grey pebbles	12.7
Light grey pebbles	22.6
Light grey pebbles	17.6
Light grey pebbles	14.4
Light grey pebbles	23.7
Light grey pebbles	21.5
Dark grey pebbles	6.0
Dark grey pebbles	8.5
Dark grey pebbles	16.8
Dark grey pebbles	2.9
Dark grey pebbles	3.2
Dark grey pebbles	11.4
Dark grey pebbles	8.9
Dark grey pebbles	17.8
Dark grey pebbles	1.7
Dark grey pebbles	10.4
Dark grey pebbles	24.3
Dark grey pebbles	16.8
Dark grey pebbles	41.4
Dark grey pebbles	11.0
Dark grey pebbles	10.8
Dark grey pebbles	17.3
Twigs	9.0
Twigs	26.5
Twigs	5.0
Twigs	3.8
Twigs	19.0
Twigs	15.1
Twigs	18.5
Twigs	12.6
Twigs	7.8
Twigs	21.0