Table 1. — Months of birth of raccoons in the northern half of Illinois, as determined by actual births or as estimated from exami- 
nation of embryos. 
Number of Litters Conceived in 
Number of Litters Conceived in the Wild That Had Actual 
laptivity That Were Born Number of Wild or Potential Birth Date in 
Month in Month Designated Females Examined * Month Designated? 
JEWEN os bone oan to ba dnt commober aeoa ume 0 160 0 
Bebruanyanen eng c Ceri entta eine actiaamaietne 0 6 0 
IN Eire alo eat tonic ne etre ea cuctamres te Moi SES Cie ot 2 15 
YN chs tls Wai cutnie mice Bere me Gee menciais Sn Ue o 1 18 11 
IME ard olitathtae aon Damon mon Eamon. Got ponents 2 9 1 
i [eit ea dee San cra momen Ge oano odes ao muak 1 5 1 
tic oie Honus Eotottomocaopgosaor aceon GD 0 11 0 
INTRA POs Coop Ondoce omar Cae aU as Pa o.oo o 0 4 0 
* Many nonpregnant, adult females examined in the period April-August were lactating. 
+ Dates of potential birth were estimated as described by Llewellyn (1943) for all but four litters, which were born in captivity. 
Table 2. — Average body weights of captive raccoons of known ages, by 2-week intervals; 33 individuals were involved. The average 
date of birth of these raccoons was April 16. 
Number Average Standard Standard Deviation 
Age of Animals Weight in Deviation of of the Mean 
in Days Weighed Pounds the Sample (Standard Error) 
NURSING 
esti er ewan pith eee Groin tose wine ts Grobe eee oskerecls 7 0.1 0.05 0.02 
GHB 0) pach sues eieteie cane: oreicie Gav a ams Appear «See cimboree rete Take 19 0.7 0.33 0.08 
PEAS aA Bie, cas sacra Sie aes PRINS Se ict ates GHPagOS 12 0.9 0.53 0.15 
AG=O0 rete pers ot cut URS cussion otter Teh e e Cle Satie 3 2.0 0.17 0.14 
NO LONGER WITH FEMALES 
GHD ee tae Ciena Eee aS Ce Ona OO rar a 1 0.6 
A erence te cis esis ea oacuare cures eee eire caecavoeas aie sovenetat 1 0.6 e¢ its 
AG=G Ole epee ah Arsen hesciskare Rae re eae Ae Ee ees 8 1.9 0.12 0.34 
lS TiGTe n picnSicinto aio Meaeveromeatietnii nh choad Gin aio cpt tical Oc 26 2.2 0.19 0.04 
DO=9 Oise meence naeet totees. orceede te esw oie: eet ual sippepsietsnsssnstaes allay 28 She 0.17 0.91 
SN Dis ety Meter a len S8 eleven Nadie shars oa aaa tae osoreeesen 21 4.0 0.21 0.96 
NO G=2 Olean eevee 2 crete ere ees g tere apse deere cress W 4.1 0.27 0.72 
PIA as Grane ce ieee era engi ernie ernest Ae 10 Gat 0.24 0.77 
SOAS OR isse cise SUS ac Pea Ohare ee ea Reena 10 6.3 0.24 0.74 
MSG Okra tecrtveratt en 2 sun ans cesta Gave emarave cbarecsbayUaror stares 2 6.8 0.06 0.63 
IGA ee Gites aeeemcn Caton Moc. ack arin ien cere ae 4 6.8 0.42 0.84 
Table 3. — Average body weights of wild raccoons that were caught in live traps two or more times each; 60 individuals were involved. 
The age of each animal the first time it was caught was estimated on the basis of its body weight. 
Number Average Standard Standard Deviation 
Age of Animals Weight in Deviation of of the Mean 
in Days Weighed Pounds the Sample (Standard Error) 
A On epeyacs cts vetoed hata ene leti = ateemonetoieLoe Lois cnePeReFsRens Oke 1 Nail owas 2 dere 
AG= GOK aoe are aisles egpistens ceeb tehey sicishot ces Sine eaT Leteneyeaveter eke 4 Weg) 0.43 0.21 
(SEY Digra eee ee 4 bg amip in ota pie fork Cae sree 8 25 0.44 0.15 
SSS iow saa tire aoticiald Guo mae HOB C CSCO Rte > AOR OOe 25 Dei 0.36 0.07 
QUT OS 5 tive sot dias aus lacionsnsge vote 3 ee etelerete aac) é lero siete pomete 24 2e9 0.43 0.09 
MOGSUZOS, oh fevd-e etanae sacieretete oats = ares rete Os a aw, cite 28 3.5 0.73 0.14 
DANSE ere cussed & arcade ie hed eresntofeaieanct sre ii atte eine 18 4.0 0.96 0.23 
TSOH M5 Os oteatote coals ehoker ahs has Meese mneore rere omtaere 15 4.2 0.43 0.11 
ST SUG Se trun <cten teehere opeenmttr peti ee as © 14 5.4 1.24 0.33 
TOO=TS 0... - aheacnssscec sl ohare uuipetevacge w roape Oe un ene 15 5.4 1.38 0.36 
SDT OG i troee watt wisn cxahernPlee cere auaRee fis uast reeds m statins 8 ied 1.05 0.37 
WO G Di Ore Na ccenrssst ten een aa aiebin wee cc. susetu mires te his 8 Wine 1.08 0.38 
PRINS PA Yes ea gee ALT et sn Ven ed or oe IITBC CMa US Oe 3 10.2 0.60 0.35 
ZOO — 2A iE Ren nto wie sercienulo eo heii! sists eee iris 4) as 4 9.2 1-05 0.57 
(XM DAs on eke SCO a ET AN Cate oe DOR TIC as ae 
PHC =Y AD ERS PSC Aind CUSEENS leet d On aK IO TO SOE 1 dE) 
HEIR SA tao OPIS ee ATOR Meng CO oe ORT SIO 1 6.0 on 
ZEO—SO0 se manncoelrntcse Wehesy a tenvoya tear Cnike aera heretee 2 8.8 0.99 0.70 
8 
