=================+===========================+============================ | Arrival | Departure SPECIES +-----------------+---------+------------------+--------- | Range | Median | Range | Median -----------------+-----------------+---------+------------------+--------- Bobolink | May 4-May 21 | May 11 | Aug. 28-Oct. 1 | Sept. 12 Yellow-headed | | | | Blackbird | Mar. 31-Apr. 29 | Apr. 19 | Sept. 19-Oct. 18 | Sept. 24 Orchard Oriole | Apr. 25-May 14 | May 4 | Aug. 5-Sept. 15 | Aug. 9 Baltimore Oriole | Apr. 24-May 5 | Apr. 29 | Sept. 6-Sept. 29 | Sept. 10 Common Grackle | Mar. 2-Mar. 27 | Mar. 17 | Oct. 15-Nov. 14 | Oct. 31 -----------------+-----------------+---------+------------------+--------- =Orchard Oriole=: _Icterus spurius_ (Linnaeus).--This summer resident is common in parkland, woodland, and old second-growth. Temporal occurrence is indicated in Table 18. _Breeding schedule._--The 118 records of breeding span the period May 11 to August 10 (Fig. 8); the modal date for completion of clutches is June 5, and 45 per cent of all eggs are laid in the first ten days of June. _Number of eggs._--Clutch-size is 4 eggs (4.1, 3-6; 41). Clutches laid at the peak of the season average 4.3 eggs (3-6; 26), and replacement clutches average 3.8 eggs (3-4; 9). Nests are hung about 15 feet high (ranging from six to 55 feet) in elm, cottonwood, hackberry, locust, catalpa, willow, alder, osage orange, walnut, pear, linden, and ash. =Baltimore Oriole=: _Icterus galbula_ (Linnaeus).--This common summer resident is most numerous in the east, in woodland and riparian timber. The species hybridizes freely with the Bullock Oriole in western Kansas, and individuals morphologically typical of Baltimore Orioles are rare west of the 100th meridian. Evidence of such hybridization can be found in specimens taken in eastern Kansas, but the linear nature of distribution along water-courses to the west restricts gene-flow, and evident hybrids are not yet conspicuous. Temporal occurrence is indicated in Table 18. _Breeding schedule._--Eighty-three records of breeding span the period May 11 to July 10 (Fig. 8); the modal date of egg-laying is June 5, and 66 per cent of all eggs are laid between May 21 and June 10. _Number of eggs._--Clutch-size is 4 eggs. Nests are hung about 24 feet high (ranging from nine to 70 feet) in elm, cottonwood, sycamore, maple, and oak.