Assertion: puffin's burrow | /r/MadeOf | egg
Facets:
value: in may
type: TEMPORAL
Source sentences:
text: , Puffin breeding success was estimated by marking burrows that contained an egg in May (mean of approximately 84 burrows per year, ranging from 40 in 2004 to 133 in 2010) and re-checking each burrow for the presence or absence of a large chick in July and early August .